Dyfyniad APA

(2004). Academic periodicals collection. Massacgusetts: Ebsco.

Dyfyniad Arddull Chicago

Academic Periodicals Collection. Massacgusetts: Ebsco, 2004.

Dyfyniad MLA

Academic Periodicals Collection. Massacgusetts: Ebsco, 2004.

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