Queenan, J. T. (1990). Natural family planning : current knowledge and new strategies for the 1990s: Proceedings of a conference , part II, Georgetown University, Washington, DC, December, 10-14, 1990. Georgetown University Institute for Reproductive Health.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Queenan, John T. Natural Family Planning : Current Knowledge and New Strategies for the 1990s: Proceedings of a Conference , Part II, Georgetown University, Washington, DC, December, 10-14, 1990. Washington, DC: Georgetown University Institute for Reproductive Health, 1990.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Queenan, John T. Natural Family Planning : Current Knowledge and New Strategies for the 1990s: Proceedings of a Conference , Part II, Georgetown University, Washington, DC, December, 10-14, 1990. Georgetown University Institute for Reproductive Health, 1990.