Dyfyniad APA

Robert A. Hatcher & 1937-. (1980). Contraceptive technology, 1980-1981 (10th rev. ed.). Irvington Publishers.

Dyfyniad Arddull Chicago

Robert A. Hatcher and 1937-. Contraceptive Technology, 1980-1981. 10th rev. ed. New York: Irvington Publishers, 1980.

Dyfyniad MLA

Robert A. Hatcher and 1937-. Contraceptive Technology, 1980-1981. 10th rev. ed. Irvington Publishers, 1980.

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