Puerto Rico. Commonwealth Board of Elections. (1983). Results of elections, San Juan, 1904-1980.
Chicago-referens (17:e uppl.)Puerto Rico. Commonwealth Board of Elections. Results of Elections, San Juan, 1904-1980. 1983.
MLA-referens (8:e uppl.)Puerto Rico. Commonwealth Board of Elections. Results of Elections, San Juan, 1904-1980. 1983.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.