Bruno, Greg. Reshuffling the Political Deck. Backgrounder: Iraq's Political Landscape. Council on Foreign Relations. February 5, 2009 [July 8, 2012]. (原始内容存档于2012-11-18).
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Electoral Systems in Europe: An Overview. European Parliament in Brussels: European Centre for Parliamentary Research and Documentation. October 2000 [July 6, 2012]. (原始内容存档于2013年5月9日).
Electoral Systems in Europe: An Overview. European Parliament in Brussels: European Centre for Parliamentary Research and Documentation. October 2000 [July 6, 2012]. (原始内容存档于2013年5月9日).
Bruno, Greg. Reshuffling the Political Deck. Backgrounder: Iraq's Political Landscape. Council on Foreign Relations. February 5, 2009 [July 8, 2012]. (原始内容存档于2012-11-18).
Country Profile: Sweden. ElectionGuide. Consortium for Elections and Political Process Strengthening. 2010-08-08 [07/08/2012]. (原始内容存档于2016-03-29).请检查|access-date=中的日期值 (帮助)