Dyfyniad APA

(1980). Energy in Amernica. California: University of Southern California Press.

Dyfyniad Arddull Chicago

Energy in Amernica. California: University of Southern California Press, 1980.

Dyfyniad MLA

Energy in Amernica. California: University of Southern California Press, 1980.

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