Philippines. National Statistics Office. (1990). 1990 Census of population and housing: Research no. 1. NSO.
Citazione stile Chigago Style (17a edizione)Philippines. National Statistics Office. 1990 Census of Population and Housing: Research No. 1. Manila: NSO, 1990.
Citatione MLA (9a ed.)Philippines. National Statistics Office. 1990 Census of Population and Housing: Research No. 1. NSO, 1990.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.