Dyfyniad APA

(1957). Royal College of Obstetricians and Gynaecologists.

Dyfyniad Arddull Chicago

Royal College of Obstetricians and Gynaecologists. 1957.

Dyfyniad MLA

Royal College of Obstetricians and Gynaecologists. 1957.

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