Dyfyniad APA

Hatcher, R. A., & Williams, N. B. (1986). Contraceptive technology, 1986-1987 (13th, rev. ed.). Irvington Pub.

Dyfyniad Arddull Chicago

Hatcher, Robert A., and Nadine B. Williams. Contraceptive Technology, 1986-1987. 13th, rev. ed. New York: Irvington Pub, 1986.

Dyfyniad MLA

Hatcher, Robert A., and Nadine B. Williams. Contraceptive Technology, 1986-1987. 13th, rev. ed. Irvington Pub, 1986.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.