Dyfyniad APA

(1996). American government: Principles and practices. USA: McGraw-Hill.

Dyfyniad Arddull Chicago

American Government: Principles and Practices. USA: McGraw-Hill, 1996.

Dyfyniad MLA

American Government: Principles and Practices. USA: McGraw-Hill, 1996.

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