Denis Pilon, "The Politics of Voting", Edmond Montgomery Publications, 2007
Josep M. Colomer. Political Institutions. Oxford University Press, 2003.
Josep M. Colomer ed. Handbook of Electoral System Choice. Palgrave-Macmillan, 2004.
John Hickman và Chris Little. "Seat/Vote Proportionality in Romanian and Spanish Parliamentary Elections" Journal of Southern Europe and the Balkans Vol. 2, No. 2, November 2000
Martin Linton and Mary Southcott. "Making Votes Count: The Case for Electoral Reform", Profile Books Ltd, London, 1998.
Amy, Douglas J. "Real Choices/New Voices: The Case for Proportional Representation Elections in the United States". Columbia University Press, 1993.
Roland Nicholson, Jr., "Proportional Representation Elections in Hong Kong", New York Times, September, 1992
