Cita APA (7th ed.)

Sanchez, C. A. (1991). Population education (psychological, sociological, biological, anthropological) (rev. ed.). National Book Store.

Cita Chicago (17th ed.)

Sanchez, Custodiosa A. Population Education (psychological, Sociological, Biological, Anthropological). rev. ed. Manila: National Book Store, 1991.

Cita MLA (9th ed.)

Sanchez, Custodiosa A. Population Education (psychological, Sociological, Biological, Anthropological). rev. ed. National Book Store, 1991.