1990 census of population and housing. Report no. 7, Population, land area and density, 1970, 1980 and 1990
MLA
1990 Census of Population and Housing. Manila: Republic of the Philippines, National Statistics Office, 1994
APA, 7th edition
(1994). 1990 census of population and housing. Manila: Republic of the Philippines, National Statistics Office
Chicago, 17th edition
1990 census of population and housing. Manila: Republic of the Philippines, National Statistics Office, 1994