Cita APA (7a ed.)
Kippley, J. F., & Kippley, S. (1979). The art of natural family planning. Couple to couple League.
Cita Chicago Style (17a ed.)
Kippley, John F., y Sheila Kippley. The Art of Natural Family Planning. Cincinnati: Couple to couple League, 1979.
Cita MLA (9a ed.)
Kippley, John F., y Sheila Kippley. The Art of Natural Family Planning. Couple to couple League, 1979.
Precaución: Estas citas no son 100% exactas.