Sanchez, C. A. (1991). Population education (psychological, sociological, biological, anthropological) (rev. ed.). National Book Store.
Chicago-referens (17:e uppl.)Sanchez, Custodiosa A. Population Education (psychological, Sociological, Biological, Anthropological). rev. ed. Manila: National Book Store, 1991.
MLA-referens (9:e uppl.)Sanchez, Custodiosa A. Population Education (psychological, Sociological, Biological, Anthropological). rev. ed. National Book Store, 1991.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.