Dyfyniad APA

Yearbook (National Society for the Study of Education).

Dyfyniad Arddull Chicago

Yearbook (National Society for the Study of Education).

Dyfyniad MLA

Yearbook (National Society for the Study of Education).

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