Philippines. National Manpower and Youth Council. Office of Manpower Planning and Coordination. Research and Evaluation Division. (1990). Manpower factbook 1990-. NMYC.
Chicago-referens (17:e uppl.)Philippines. National Manpower and Youth Council. Office of Manpower Planning and Coordination. Research and Evaluation Division. Manpower Factbook 1990-. [Manila]: NMYC, 1990.
MLA-referens (9:e uppl.)Philippines. National Manpower and Youth Council. Office of Manpower Planning and Coordination. Research and Evaluation Division. Manpower Factbook 1990-. NMYC, 1990.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.