Dyfyniad APA

American Medical Association. (1981). American medical directory update. The Association.

Dyfyniad Arddull Chicago

American Medical Association. American Medical Directory Update. Chicago: The Association, 1981.

Dyfyniad MLA

American Medical Association. American Medical Directory Update. The Association, 1981.

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