APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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