Center for Voting and Democracy's Proportional Representation Library
- Repository of articles about proportional representation.
- http://www.fairvote.org/pr/index.html

Fair Vote Canada
- The primary purpose of Fair Vote Canada is to gain broad support for a national process to enable Canadian voters to choose which voting system shall be used to elect their representatives.
- http://www.fairvotecanada.org

Washington State Citizens for Proportional Representation
- Represents Washington State voters dedicated to fair representation in local, state, and federal elections, by increasing voter awareness of alternative methods of elections.
- http://www.fairvote.net/washington/

Under the Cloak of Patriotism
- History of Proportional Representation in New York City Council Elections in the 1930s-1940s. Describes how World War II and the early Cold War influenced local politics and the fate of "PR."
- http://www.nyu.edu/gsas/dept/history/public_history/PR/

Proportional Representation Library
- A source of information on proportional representation elections -- including beginning readings, in-depth articles by scholars and activists, an extensive bibliography, and a guide to relatedWeb sites.
- http://www.mtholyoke.edu/acad/polit/damy/prlib.htm