Press Foundation of Asia & United Nations Fund for Population Activities. (1981). Philippines. United Nations Fund for Population Activities.
Cita Chicago (17th ed.)Press Foundation of Asia i United Nations Fund for Population Activities. Philippines. New York: United Nations Fund for Population Activities, 1981.
Cita MLA (9th ed.)Press Foundation of Asia i United Nations Fund for Population Activities. Philippines. United Nations Fund for Population Activities, 1981.
Atenció: Aquestes cites poden no estar 100% correctes.