Dyfyniad APA
Kippley, J. F., & Kippley, S. (1979). The art of natural family planning. Couple to couple League.
Dyfyniad Arddull Chicago
Kippley, John F., and Sheila Kippley. The Art of Natural Family Planning. Cincinnati: Couple to couple League, 1979.
Dyfyniad MLA
Kippley, John F., and Sheila Kippley. The Art of Natural Family Planning. Couple to couple League, 1979.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.