Puerto Rico: Sources

• Documents on the Constitutional History (1964). "Documents on the Constitutional History of Puerto Rico" (Office of the Commonwealth of Puerto Rico, 1964)
• Congressional Record (1873-2012). "Congressional Record: Containing the Proceedings and Debates of the 43d Congress March 4, 1873-to date" (Washington: Government Printing Office, 1874-2012) (web site, web site, web site)