Redigerer Mário Soares (avsnitt)

== Kilder ==
* Birmingham, David: ''A Concise History of Portugal'', 2. utgave, Cambridge: Cambridge University Press, 2003. ISBN 0-521-53686-3
* Evans, Ana Maria: «The Adjustment of Portuguese Political Parties to the Challenges of Multilevel Governance: A Comparative Analysis of Political Affiliation in the European Parliament», i Sebastián Royo (red.): ''Portugal in the Twenty-First Century. Politics, Society, and Economics'', Lanham, MD: Lexington Books, 2012, s. 69–91. ISBN 978-0-7391-3756-7
* Heidar, Knut og Einar Berntzen: ''Vesteuropeisk politikk. Partier, regjeringsmakt, styreform'', Oslo: Universitetsforlaget, 1993
* Lobo, Marina Costa, António Costa Pinto og Pedro Magalhães: «The Political Institutions of Portuguese Democracy», i Sebastián Royo (red.): ''Portugal in the Twenty-First Century. Politics, Society, and Economics'', Lanham, MD: Lexington Books, 2012, s. 23–48. ISBN 978-0-7391-3756-7
* Neto, Octavio Amorim og Marina Costa Lobo: «Portugal's Semi-Presidentialism (Re)Considered: An Assessment of the President's Role in the Policy Process», 1976-2006, i Sebastián Royo (red.): ''Portugal in the Twenty-First Century. Politics, Society, and Economics'', Lanham, MD: Lexington Books, 2012, s. 49–68. ISBN 978-0-7391-3756-7