Dyfyniad APA

Columbia University. Teachers College. Teachers College record. Blackwell Pub.

Dyfyniad Arddull Chicago

Columbia University. Teachers College. Teachers College Record. [Oxford]: Blackwell Pub.

Dyfyniad MLA

Columbia University. Teachers College. Teachers College Record. Blackwell Pub.

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