Dyfyniad APA

Bulletin of the Department of Secondary-School Principals.

Dyfyniad Arddull Chicago

Bulletin of the Department of Secondary-School Principals.

Dyfyniad MLA

Bulletin of the Department of Secondary-School Principals.

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