Dyfyniad APA

Annals of the American Association of Geographers. Association of American Geographers.

Dyfyniad Arddull Chicago

Annals of the American Association of Geographers. Association of American Geographers.

Dyfyniad MLA

Annals of the American Association of Geographers. Association of American Geographers.

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