Freedom House. Freedom in the World 2011: The Annual Survey of Political Rights and Civil Liberties. Rowman & Littlefield Publishers. 2011-12-01: 649 [2020-02-17]. ISBN 978-1-4422-0996-1. (原始内容存档于2017-04-28). Altermatt, Urs. CVP: Von der katholischen Milieupartei zur Partei der bürgerlichen Mitte. Die Parteien in Bewegung: Nachbarschaft und Konflikte (Verlag Neue Zürcher Zeitung). 2013: 36–37. Burlacu, Diana; Tóka, Gábor. Policy-based Voting and the Type of Democracy. Elections and Democracy: Representation and Accountability (Oxford University Press). 2014. Budge, Ian; Keman, Hans; McDonald, Michael D.; Pennings, Paul. Organizing Democratic Choice: Party Representation Over Time. Oxford University Press. 2012: 134.
Freedom House. Freedom in the World 2011: The Annual Survey of Political Rights and Civil Liberties. Rowman & Littlefield Publishers. 2011-12-01: 649 [2020-02-17]. ISBN 978-1-4422-0996-1. (原始内容存档于2017-04-28). Altermatt, Urs. CVP: Von der katholischen Milieupartei zur Partei der bürgerlichen Mitte. Die Parteien in Bewegung: Nachbarschaft und Konflikte (Verlag Neue Zürcher Zeitung). 2013: 36–37. Burlacu, Diana; Tóka, Gábor. Policy-based Voting and the Type of Democracy. Elections and Democracy: Representation and Accountability (Oxford University Press). 2014. Budge, Ian; Keman, Hans; McDonald, Michael D.; Pennings, Paul. Organizing Democratic Choice: Party Representation Over Time. Oxford University Press. 2012: 134.
Freedom House. Freedom in the World 2011: The Annual Survey of Political Rights and Civil Liberties. Rowman & Littlefield Publishers. 2011-12-01: 649 [2020-02-17]. ISBN 978-1-4422-0996-1. (原始内容存档于2017-04-28). Altermatt, Urs. CVP: Von der katholischen Milieupartei zur Partei der bürgerlichen Mitte. Die Parteien in Bewegung: Nachbarschaft und Konflikte (Verlag Neue Zürcher Zeitung). 2013: 36–37. Burlacu, Diana; Tóka, Gábor. Policy-based Voting and the Type of Democracy. Elections and Democracy: Representation and Accountability (Oxford University Press). 2014. Budge, Ian; Keman, Hans; McDonald, Michael D.; Pennings, Paul. Organizing Democratic Choice: Party Representation Over Time. Oxford University Press. 2012: 134.