Chapter 11
Political Parties of the World (7th ed.). D. J. Sagar, ed. John Harper Publishing, 2009. Available (by institutional or individual subscription)
Political Database of the Americas (Georgetown University): http://pdba.georgetown.edu/
Latin American Network Information Center (LANIC, University Texas): http://lanic.utexas.edu/subject/government/
Politics Handbook of the World http://library.cqpress.com (via institutional subscription). See section on “Party System.”