Richards, T. (1983). Comparative analysis of fertility, breastfeeding and contraception: A dynamic model. National Academy Press.
Cita Chicago (17th ed.)Richards, Toni. Comparative Analysis of Fertility, Breastfeeding and Contraception: A Dynamic Model. Washington, D. C: National Academy Press, 1983.
Cita MLA (9th ed.)Richards, Toni. Comparative Analysis of Fertility, Breastfeeding and Contraception: A Dynamic Model. National Academy Press, 1983.
Atenció: Aquestes cites poden no estar 100% correctes.