Dyfyniad APA

(2004). Essentials of obstetrics and gynecology. Philadelphia, Pa: Saunders.

Dyfyniad Arddull Chicago

Essentials of Obstetrics and Gynecology. Philadelphia, Pa: Saunders, 2004.

Dyfyniad MLA

Essentials of Obstetrics and Gynecology. Philadelphia, Pa: Saunders, 2004.

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