Dyfyniad APA

American Hereford Association. The American Hereford journal. Hayes Walker.

Dyfyniad Arddull Chicago

American Hereford Association. The American Hereford Journal. Kansas City, Mo.: Hayes Walker.

Dyfyniad MLA

American Hereford Association. The American Hereford Journal. Hayes Walker.

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