Dyfyniad APA

(2005). Academic periodicals collection. Massachusetts: Ebsco.

Dyfyniad Arddull Chicago

Academic Periodicals Collection. Massachusetts: Ebsco, 2005.

Dyfyniad MLA

Academic Periodicals Collection. Massachusetts: Ebsco, 2005.

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