APA (7th ed.) Citation

Lopez, D. F., & Osorio, M. (1973). The nature of contraceptive methods. Family Planning Organization of the Philippines.

Chicago Style (17th ed.) Citation

Lopez, Danilo F., and Migen Osorio. The Nature of Contraceptive Methods. Manila: Family Planning Organization of the Philippines, 1973.

MLA (9th ed.) Citation

Lopez, Danilo F., and Migen Osorio. The Nature of Contraceptive Methods. Family Planning Organization of the Philippines, 1973.