Democrats 66

Democrats 66 Democraten 66
Abbreviation	D66
Leader	Rob Jetten (list)
Chairperson	Victor Everhardt
Leader in the Senate	Paul van Meenen
Leader in the House of Representatives	Rob Jetten
Leader in the EP	Gerben-Jan Gerbrandy
Founders	Hans van Mierlo Hans Gruijters
Founded	14 October 1966 (1966-10-14)
Headquarters	Lange Houtstraat 11, The Hague
Youth wing	Young Democrats
Policy institute	Hans van Mierlo Foundation
Membership (January 2024)	29,624
Ideology	Social liberalism Progressivism European federalism
Political position	Centre
Regional affiliation	Liberal Group
European affiliation	Alliance of Liberals and Democrats for Europe
European Parliament group	Renew Europe
International affiliation	Liberal International
Colours	Green   White
Senate	5 / 75
House of Representatives	9 / 150
King's commissioners	1 / 12
Provincial councils	33 / 570
European Parliament	3 / 31
Benelux Parliament	2 / 21
Website
d66.nl
Politics of the Netherlands Political parties Elections

Democrats 66 (Dutch: Democraten 66; D66) is a social liberal and progressive political party in the Netherlands, which is positioned in the centre of the political spectrum. It is a member of the Liberal International (LI) and the Alliance of Liberals and Democrats for Europe (ALDE).

The name of the party refers to its year of foundation, 1966. Initially, its main objective had been to democratise the Dutch political system, but it developed a broader social liberal ideology over time. In the 1967 general election, the party won 7 out of 150 seats in the House of Representatives. No new party had ever gained that many seats before. The party was in government from 1973 to 1977, 1981 to 1982, 1994 to 2002, 2003 to 2006 and 2017 to 2024. It currently holds nine seats in the House of Representatives, five seats in the Senate and three seats in the European Parliament.

D66 is especially popular among people who hold a university degree, and its voters are mostly concentrated in larger cities and in municipalities with an above-average number of wealthy residents. The party supplies a relatively large proportion of mayors, who are appointed rather than elected.

Currently, the party is led by Rob Jetten, who was elected party leader on 12 August 2023. Paul van Meenen, Rob Jetten and Gerben-Jan Gerbrandy are serving as the party's parliamentary leaders in the Senate, the House of Representatives and the European Parliament respectively.

History

Founders Hans van Mierlo and Hans Gruijters

Early years (1966–1986)

Democrats 66 was founded on 14 October 1966 by a group of 44 people. Its founders were described as homines novi, although 25 of the 44 had previously been members of another political party. The initiators were Hans van Mierlo, a journalist for the Algemeen Handelsblad, and Hans Gruijters, a municipal councillor in Amsterdam for the People's Party for Freedom and Democracy (VVD). Van Mierlo became the party's political leader. The foundation of the party was preceded by the "Appeal 1966" on October 10, in which the founders appealed to the people of the Netherlands to re-take their democratic institutions. The party renounced the 19th-century political ideologies, which dominated the political system and sought to end pillarisation. It called for radical democratisation of the Dutch political system, and for pragmatic and scientific policy-making.

Hans van Mierlo, co-founder and leader between 1966–1973 and 1986–1998

The party participated in the 1967 general election, with Hans van Mierlo as its lead candidate. The party won an unprecedented seven seats in the House of Representatives. In the 1971 general election, the party won an additional four seats and it formed a shadow cabinet with the Labour Party (PvdA) and the Political Party of Radicals (PPR). In the 1972 general election, the three parties formed a political alliance called the "Progressive Agreement" (Dutch: Progressief Akkoord; PAK) and presented the common electoral program "Turning Point '72" (Keerpunt '72).

In the election, D66 lost nearly half its seats, leaving only six. The alliance became the largest political force in the country, but it did not gain a majority. After long cabinet formation talks, the three PAK-parties formed an extra-parliamentary cabinet joined by progressive members of the Anti-Revolutionary Party (ARP) and the Catholic People's Party (KVP). The cabinet was led by Labour politician Joop den Uyl. Co-founder Hans Gruijters became Minister of Housing and Spatial Planning. After the formation talks, Van Mierlo left politics, feeling that his political position within the parliamentary party was untenable. Van Mierlo was replaced by Jan Terlouw, who became the new parliamentary leader.

Jan Terlouw, leader from 1973 to 1982

In the period 1972–1974, the party lost a dramatic number of members (from 6,000 to 300) and polled very poorly in the 1974 provincial elections. The party also lost half of its senators in the 1974 Senate election. At one of the party congresses, a motion was put forth to abolish the party. A majority of the members voted in favour, but the two-thirds majority was not reached. In reaction, Terlouw started a campaign to revitalise the party, involving a membership drive and a petition to the electorate. He emphasised issues other than democratic reform and gave the party a more liberal orientation. The party doubled its membership in 1975 and won two additional seats in the 1977 general election, despite losing all its seats in the Senate in the same year.

In the 1981 general election, D66 gained 17 seats. The party formed a government with the Labour Party and the Christian Democratic Appeal (CDA), with Terlouw as Minister of Economic Affairs. The cabinet was characterised by the personal and ideological conflicts between Prime Minister Dries van Agt (CDA) and Minister of Social Affairs Joop den Uyl (PvdA). The cabinet fell nine months after it was formed, when the Labour Party left the cabinet. D66 and the CDA continued to govern in a caretaker government. In the subsequent 1982 general election, D66 lost two-thirds of its support, and was left with only 6 seats. After the election, Terlouw left politics and was replaced by Maarten Engwirda. The party was confined to opposition.

Purple cabinets and demise (1986–2006)

In 1986, Van Mierlo returned to politics. He emphasised democratic reform as the core issue of the party and wanted to end the polarisation between the Labour Party and VVD, so that it would be possible to form a government without the CDA. He led the party in the 1986 general election and won nine seats. In the 1989 election, the party won 12 seats and was asked to join the formation talks of a CDA–PvdA–D66 coalition. While the PvdA preferred to form a government with D66, the CDA did not. Ultimately, D66 was excluded from the coalition, because it was not necessary to include them to reach a majority in parliament.

Despite being in opposition, D66 adopted a constructive approach towards the government. They were rewarded for this in the 1994 general election, in which the party doubled its number of seats to 24. D66 was able to form its preferred coalition: the "purple government", which included both the social democratic PvdA and the conservative liberal VVD. Van Mierlo was appointed Minister of Foreign Affairs. As advocated by D66, the first Kok cabinet initiated progressive legislation, such as the introduction of same-sex marriage and the legalisation of euthanasia. The moderately liberal economic policies of the cabinet were also seen as a great success.

Els Borst, top candidate in the 1998 general election

Shortly before the 1998 general election, Van Mierlo stepped back and Minister of Health Els Borst became the new top candidate. D66 lost ten seats in the election, while its coalition partners gained ground at the cost of D66. The second Kok cabinet continued. Although D66 was technically not needed for a majority in parliament, it was seen as the glue that kept the PvdA and the VVD together. Borst stepped down as party leader and became Deputy Prime Minister and Minister of Health. Thom de Graaf led the party in the House of Representatives. From within the party, there were calls for a more explicit progressive liberal course. In 1999, a constitutional reform that would allow for referendums to be held was rejected by the Senate, because a group of VVD dissidents had voted against it. In response, D66 left the cabinet. After the subsequent formation talks, D66 returned to the cabinet in return for a temporary referendum law and directly elected mayors.

In the 2002 general election, the tide had turned against the purple government, and the right-wing populist Pim Fortuyn List (LPF) gained considerable ground. The three purple parties lost an unprecedented 43 seats. D66 was left with only seven seats. The first Balkenende cabinet, consisting of CDA, LPF and VVD, lasted only three months. In the 2003 general election, D66 lost another seat, leaving only 6. De Graaf stepped down and was succeeded by Boris Dittrich. After long formation talks between the CDA and the PvdA failed, a second Balkenende cabinet was formed, which included the CDA, the VVD and D66.

In return for investments in environment and education, and a special Minister for Governmental Reform, D66 supported the centre-right reform cabinet and some of its more controversial legislation. In May 2005, the Senate rejected a constitutional reform that would allow a directly elected mayor. The legislation had been introduced by the second Kok cabinet, but it was unable to get a two-thirds majority because the Labour Party was opposed the electoral system proposed by Minister for Governmental Reform Thom de Graaf. De Graaf resigned, but the rest of the ministers retained their positions as D66 was promised more investment in public education and the environment. A special party congress was called to ratify this so-called "Easter Agreement" (Paasakkoord). 2,600 members (20 per cent of total membership) were present and the congress was broadcast live on television. The congress agreed to remain in cabinet by a large majority. Alexander Pechtold replaced De Graaf as Minister for Governmental Reform. Laurens Jan Brinkhorst, the Minister of Economic Affairs, became Deputy Prime Minister.

Alexander Pechtold, leader from 2006 to 2018

Pechtold leadership (2006–2016)

In February 2006, Dittrich stepped down as parliamentary leader, because he did not agree with the government's decision to send the Dutch armed forces to the southern province of Uruzgan in Afghanistan. D66 voted against the government's proposal together with the Socialist Party and GroenLinks. Dittrich stated that the mission to send troops was not a reconstruction mission (as the government and the majority of the Dutch parliament claimed), but a military operation. Lousewies van der Laan replaced Dittrich. In May 2006, D66 polled particularly badly in the 2006 municipal elections. D66 began to lose a considerable number of members, some of whom founded deZES, another radical democratic, progressive liberal party. During a special party congress on 13 May 2006, a motion was put forth demanding the withdrawal of D66 from the cabinet, but it was rejected. In June 2006, an internal election was held in order to choose the new party leader. The election was won by Alexander Pechtold.

During the special parliamentary debate on the naturalisation process of Ayaan Hirsi Ali, D66 supported a motion of no confidence against Minister for Integration Rita Verdonk. As D66 was a junior coalition partner, this caused a crisis in the second Balkenende cabinet. The cabinet refused to remove Verdonk from her position. Lousewies van der Laan, parliamentary leader of D66, felt that the D66 faction could no longer support the cabinet and stated that the cabinet had to resign. On 3 July 2006, the two D66 ministers Alexander Pechtold and Laurens Jan Brinkhorst resigned, causing the second Balkenende cabinet to fall.

In October 2006, just before the D66 party congress and its 40th anniversary as a party, D66 founder Hans van Mierlo asked the question whether D66 still had political legitimacy. He believed that many errors were made in recent history and that only the acceptance of these errors could provide for any credibility for D66. Van Mierlo declared his support for party leader Pechtold, who in his view could provide for such credibility.

Sigrid Kaag, leader from 2020 to 2023

Since 2008, the party has performed quite well in the opinion polls, ranging from 10 to 26 seats, compared to only 3 seats in the House of Representatives. In the 2009 European Parliament election, the party won 11% of the votes and 3 seats, two more than in the previous election. The news programme Nova attributed this increase to the leadership of Alexander Pechtold, who was considered "the leader of the opposition" at the time. Under the leadership of Pechtold, the party has taken strong stances against the Party for Freedom (PVV) of Geert Wilders. In the 2010 general election, D66 increased its representation to 10 seats. In the 2012 general election, the party further increased its number of seats to 12. Since 2008, the party has experienced a significant increase in party membership, from 10,000 to 25,000 in 2015.

In the 2017 general election, D66 won 19 seats in the House of Representatives and formed a centre-right coalition government with the VVD, CDA and Christian Union (CU). Kajsa Ollongren was appointed second Deputy Prime Minister in the third Rutte cabinet.

Kaag and Jetten leadership (2018–present)

In October 2018, Alexander Pechtold announced his retirement from politics. He was replaced by Rob Jetten as parliamentary leader, but the position of party leader remained vacant. In September 2020, Minister for Foreign Trade and Development Cooperation Sigrid Kaag was elected the new party leader and top candidate for the 2021 general election. Despite the fact that the opinion polls had predicted D66 to lose seats, the party won 24 seats in the 2021 election, becoming the second largest party in the House of Representatives. On 12 August 2023 Rob Jetten became the leader of the party. Following the 2023 Dutch general election D66 lost more seats than any party, being reduced from 24 to 9, their worst result in 17 years.

Ideology

Campaign for the 2021 Dutch general election

The ideology of D66 is a highly contested subject within the party and the question is tied to the reason for its existence. There are two currents within the party, namely the radical democrats and the progressive liberals. Although sometimes antagonistic, these two currents currently complement each other as both emphasise the self-realisation of the individual. The Radical League and the Free-thinking Democratic League, two early 20th century parties are historic exponents of these two traditions.

Factions

Radical democrats

The first party congress emphasised radical democratisation of Dutch society and the political system. Its ideal was a two-party system. To obtain this, it wanted to reform the electoral system after the American first past the post model. The electoral reform was gradually moderated as the party now favours German-style mixed member proportional representation. In this system, a national party-list election is used to make a first-past-the-post election representative to the nationwide vote. This radical democratisation was combined with a pragmatic and anti-dogmatic attitude towards politics. Hans van Mierlo, the party's leader between 1966 and 1972 and between 1986 and 1998 and the party's figurehead, was an important exponent of this tendency within the party.

Progressive liberals

D66's progressive liberal section has historically been much weaker than its radical democratic wing. Under Jan Terlouw between 1972 and 1982, D66 began to emphasise new issues like the environment, public education and innovation. He called D66 a fourth current, next to social democracy, Christian democracy and the conservative liberalism of the VVD. In 1998, the group Opschudding called for a progressive liberal course for the party. In the party's manifesto adopted in 2000, the party explicitly adopted a progressive liberal image. National political reasons explain the usage of the label "social-liberal" since the more right-leaning VVD describes itself as the liberal party.

Positions

Some of the party's most important positions include:

• D66 is in favour of a mixed economy combining market economics and government intervention. D66 is also a proponent of increased flexibility in the labour market and tax cuts for the lower and middle classes.
• D66 proposes to increase government spending on education and innovation, for instance increases in teachers' salaries. D66 wants the education sector to be deregulated and introduce more competition in the sector.
• The environment is an important issue for the party. D66 favours a carbon price and more investment in sustainable energy to combat global warming. It opposes the right to hunt and sees hunting only as last resort for wildlife damage control.
• D66 is a socially liberal party. The first Kok cabinet in which it participated introduced several liberal reforms in the past, such as the legalisation of euthanasia, same-sex marriage and prostitution.
• D66 is a proponent of democratic reform. It favours electoral reforms such as a binding referendum, abolition of the Senate and direct election of prime ministers and mayors.
• D66 favours a Federal Europe and more European cooperation on issues such as the environment, immigration policy and foreign policy.

Electorate

Although supporters of political parties are no longer fixed and election results fluctuate, D66 is overall strong and concentrated in the Randstad conurbation, while also getting its votes in and around university towns. In the 2014 municipal elections, D66 became the largest party in many major cities including Amsterdam, The Hague, Utrecht, Tilburg, Groningen, Enschede, Apeldoorn, Haarlem, Amersfoort and Arnhem.

Election results

House of Representatives

Main article: List of members of the House of Representatives of the Netherlands, 2023–present

Election	Lead candidate	List	Votes	%	Seats	+/–	Government
1967	Hans van Mierlo	List	307,810	4.4	7 / 150	New	Opposition
1971		List	427,720	6.7	11 / 150	4	Opposition
1972		List	307,048	4.1	6 / 150	5	Coalition
1977	Jan Terlouw	List	452,423	5.4	8 / 150	2	Opposition
1981		List	961,121	11.0	17 / 150	9	Coalition
1982		List	351,278	4.3	6 / 150	11	Opposition
1986	Hans van Mierlo	List	562,466	6.1	9 / 150	3	Opposition
1989		List	701,934	7.9	12 / 150	3	Opposition
1994		List	1,391,202	15.5	24 / 150	12	Coalition
1998	Els Borst	List	773,497	9.0	14 / 150	10	Coalition
2002	Thom de Graaf	List	484,317	5.1	7 / 150	7	Opposition
2003		List	393,333	4.0	6 / 150	1	Coalition
2006	Alexander Pechtold	List	193,232	2.0	3 / 150	3	Opposition
2010		List	654,167	6.9	10 / 150	7	Opposition
2012		List	757,091	8.0	12 / 150	2	Opposition
2017		List	1,285,819	12.2	19 / 150	7	Coalition
2021	Sigrid Kaag	List	1,565,861	15.0	24 / 150	5	Coalition
2023	Rob Jetten	List	656,292	6.29	9 / 150	15	Opposition

Senate

Main article: List of members of the Senate of the Netherlands, 2023–2027

Election	Lead candidate	List	Votes	%	Seats	+/–
1971					6 / 75	New
1974					3 / 75	3
1977					0 / 75	3
1980	Jan Glastra van Loon				2 / 75	2
1981					4 / 75	2
1983					6 / 75	2
1986	Jan Vis				6 / 75
1987					5 / 75	1
1991					12 / 75	7
1995	Eddy Schuyer	List			7 / 75	5
1999		List	8,542	5.4	4 / 75	3
2003		List	7,087	4.4	3 / 75	1
2007	Gerard Schouw	List	3,270	2.0	2 / 75	1
2011	Roger van Boxtel	List	12,651	7.62	5 / 75	3
2015	Thom de Graaf	List	21,997	13.01	10 / 75	5
2019	Annelien Bredenoord	List	15,154	8.75	7 / 75	3
2023	Paul van Meenen	List	11,144	6.23	5 / 75	2

European Parliament

Election	Lead candidate	List	Votes	%	Seats	+/–	EP Group
1979	Aar de Goede	List	511,967	9.03	2 / 25	New	NI
1984	Doeke Eisma	List	120,826	2.28	0 / 25	2	–
1989	Jan-Willem Bertens	List	311,990	5.95	1 / 25	1	LDR
1994		List	481,826	11.66	4 / 31	3	ELDR
1999	Lousewies van der Laan	List	205,623	5.80	2 / 31	2
2004	Sophie in 't Veld	List	202,502	4.25	1 / 27	1	ALDE
2009		List	515,422	11.32	3 / 25	2
					3 / 26	0
2014		List	735,825	15.48	4 / 26	1
2019		List	389,692	7.09	2 / 26	2	RE
					2 / 29	0
2024	Gerben-Jan Gerbrandy	List	523,650	8.40	3 / 31	1

Organisation

Name and logo

At its foundation, the party was called Democrats '66 (Dutch: Democraten '66, abbreviated D'66). The name referred to the party's goal of radical democratisation and to the year of foundation, which was supposed to convey a modern image. In 1981, the apostrophe was dropped: the name had become a successful political brand, but the year no longer conveyed a modern image.

Logos of the Democrats 66

• 
  1966–1984
• 
  1985–2001
• 
  2002–2006
• 
  2006–2008
• 
  2008–2019
• 
  2019–present

Structure

The highest organ of the D66 is the General Assembly, in which every member can participate. It convenes multiple times per year. It appoints the party board and has the last say over the party program. The party list, including the party's parliamentary leader, for the Senate, House of Representatives, European Parliament candidates are elected directly by the members. The party has between 250 and 300 branches all over the Netherlands.

Leadership

Chairpersons

• Hans van Mierlo (14 September 1966 – 16 February 1967)
• Gerben Ringnalda (16 February 1967 – 18 November 1967)
• Hans van Lookeren Campagne (18 November 1967 – 14 December 1968)
• Jan Beekmans (14 December 1968 – 7 November 1971)
• Ruby van der Scheer (7 November 1971 – 11 March 1973)
• Jan ten Brink (11 March 1973 – 6 November 1976)
• Jan Glastra van Loon (6 November 1976 – 27 October 1979)
• Henk Zeevalking (27 October 1979 – 11 September 1981)
• Cees Spigt (Ad interim) (11 September 1981 – 14 November 1981)
• Jan van Berkom (14 November 1981 – 30 October 1982)
• Jacob Kohnstamm (30 October 1982 – 20 May 1986)
• Olga Scheltema (Ad interim) (20 May 1986 – 1 November 1986)
• Saskia van der Loo (1 November 1986 – 29 October 1988)
• Michel Jager (29 October 1988 – 3 November 1990)

• Ries Jansen (3 November 1990 – 28 November 1992)
• Wim Vrijhoef (28 November 1992 – 23 November 1996)
• Tom Kok (23 November 1996 – 20 November 1999)
• Gerard Schouw (20 November 1999 – 16 November 2002)
• Alexander Pechtold (16 November 2002 – 31 March 2005)
• Jan Hoekema (Ad interim) (31 March 2005 – 21 May 2005)
• Frank Dales (21 May 2005 – 2 March 2007)
• Gerard Schouw (Ad interim) (2 March 2007 – 12 May 2007)
• Ingrid van Engelshoven (12 May 2007 – 9 March 2013)
• Fleur Gräper (9 March 2013 – 13 September 2015)
• Letty Demmers (13 September 2015 – 6 October 2018)
• Anne-Marie Spierings (6 October 2018 – 13 November 2021)
• Victor Everhardt (13 November 2021 – present)

Parliamentary leaders

• Parliamentary leaders in the House of Representatives
  • Hans van Mierlo (23 February 1967 – 1 September 1973)
  • Jan Terlouw (1 September 1973 – 11 September 1981)
  • Laurens Jan Brinkhorst (11 September 1981 – 10 November 1982)
  • Maarten Engwirda (10 November 1982 – 3 June 1986)
  • Hans van Mierlo (3 June 1986 – 22 August 1994)
  • Gerrit Jan Wolffensperger (22 August 1994 – 21 November 1997)
  • Thom de Graaf (21 November 1997 – 19 May 1998)
  • Els Borst (19 May 1998 – 30 May 1998)
  • Thom de Graaf (30 May 1998 – 22 January 2003)
  • Boris Dittrich (22 January 2003 – 3 February 2006)
  • Lousewies van der Laan (3 February 2006 – 30 November 2006)
  • Alexander Pechtold (30 November 2006 – 9 October 2018)
  • Rob Jetten (9 October 2018 – 18 March 2021)
  • Sigrid Kaag (18 March 2021 – 25 May 2021)
  • Rob Jetten (25 May 2021 – 28 September 2021)
  • Sigrid Kaag (28 September 2021 – 10 January 2022)
  • Jan Paternotte (11 January 2022 – 22 November 2023)
  • Rob Jetten (23 November 2023 – present)

• Parliamentary leaders in the Senate
  • Bert Schwarz (11 May 1971 – 17 September 1973)
  • Paula Wassen-van Schaveren (17 September 1973 – 17 September 1974)
  • Doeke Eisma (17 September 1974 – 20 September 1977)
  • Jan Glastra van Loon (16 September 1980 – 3 December 1985)
  • Jan Vis (3 December 1985 – 1 March 1995)
  • Eddy Schuyer (1 March 1995 – 12 June 2007)
  • Gerard Schouw (12 June 2007 – 17 June 2010)
  • Hans Engels (22 June 2010 – 7 June 2011)
  • Roger van Boxtel (7 June 2011 – 9 June 2015)
  • Thom de Graaf (9 June 2015 – 26 June 2018)
  • Hans Engels (26 June 2018 – 11 June 2019)
  • Annelien Bredenoord (11 June 2019 – 12 June 2023)
  • Paul van Meenen (13 June 2023 – present)

Linked organisations

The youth wing of D66 is called the Young Democrats (Dutch: Jonge Democraten, abbreviated JD). It has produced several prominent active members of D66, such as former MP Boris van der Ham. The JD is a member of European Liberal Youth and the International Federation of Liberal Youth.

D66 is a co-founder of the Netherlands Institute for Multiparty Democracy, a democracy assistance organisation of seven Dutch political parties. The Hans van Mierlo Foundation is the party's policy institute.

International affiliation

D66 is a member of the Liberal International and of the Alliance of Liberals and Democrats for Europe (ALDE). D66 joined the Liberal and Democratic Reformists (LDR) group in 1989. It became a full member of the European Liberal Democrat and Reform Party (ELDR) in 1994 and a full member of the Liberal International in 1986.

European Parliament

The D66 delegation is part of the Renew Europe group in the European Parliament. Prior to the first European elections in 1979, D66's appointed MEPs were part of the Socialist Group, before switching to Non-Inscrits from 1979 to 1984, and the LDR/ELDR/ALDE group since 1989.

Current members of the European Parliament since the 2024 European Parliament election:

• Gerben-Jan Gerbrandy, delegation leader
• Raquel Garcia Hermida-van der Walle
• Brigitte van den Berg

Committee of the Regions

In the European Committee of the Regions, the Democrats 66 party sits in the Renew Europe CoR group, with one full and one alternate member for the 2020–2025 mandate:

• Robert van Asten (alternate)
• Ellen van Selm (member)

Water board

D66 does not run an independent list for the water board elections. Instead, like GroenLinks and Volt Netherlands, it recommends that its voters support Water Natuurlijk, an independent, green-oriented political party focused solely on water board elections.

See also

• Liberal democracy
• Liberalism in the Netherlands
• Water Natuurlijk

Further reading

• Brummer, Coen; Otjes, Simon (October 2021). Tussen bestormen en besturen. 55 jaar D66 in de Nederlandse politiek (in Dutch). Boom. ISBN 9789024441440.

External links

• Official website (in Dutch)
• International website (in English)
• Profile at DNPP (in Dutch)