Mauldin, W. P., & Segal, S. J. (1988). World trends in contraceptive use, by method, and their relationship to fertility. Population Council.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Mauldin, W. Parker, و Sheldon J. Segal. World Trends in Contraceptive Use, by Method, and Their Relationship to Fertility. New York: Population Council, 1988.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Mauldin, W. Parker, و Sheldon J. Segal. World Trends in Contraceptive Use, by Method, and Their Relationship to Fertility. Population Council, 1988.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.