Dyfyniad APA

Washington, University of. Publications in the Social Sciences. University of Washington Press.

Dyfyniad Arddull Chicago

Washington, University of. Publications in the Social Sciences. University of Washington Press.

Dyfyniad MLA

Washington, University of. Publications in the Social Sciences. University of Washington Press.

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