Style de citation APA (7e éd.)

Research Conference on Natural Family Planning, W., Urichie, W. A., & Natural family planning. (1973). Proceedings. Human Life Foundations.

Style de citation Chicago (17e éd.)

Research Conference on Natural Family Planning, Warrenton, William A. Urichie, et Natural family planning. Proceedings. Washington, D. C: Human Life Foundations, 1973.

Style de citation MLA (9e éd.)

Research Conference on Natural Family Planning, Warrenton, et al. Proceedings. Human Life Foundations, 1973.