Philippines. National Census and Statistics Office. (1982). Philippines 1980 : population, land area, and density: 1970, 1975, and 1980. NCSO.
Chicago-referens (17:e uppl.)Philippines. National Census and Statistics Office. Philippines 1980 : Population, Land Area, and Density: 1970, 1975, and 1980. Manila: NCSO, 1982.
MLA-referens (9:e uppl.)Philippines. National Census and Statistics Office. Philippines 1980 : Population, Land Area, and Density: 1970, 1975, and 1980. NCSO, 1982.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.