Dyfyniad APA

American bar association journal, Volume 59, 1973. American Bar Association.

Dyfyniad Arddull Chicago

American Bar Association Journal, Volume 59, 1973. Chicago: American Bar Association.

Dyfyniad MLA

American Bar Association Journal, Volume 59, 1973. American Bar Association.

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