Dyfyniad APA

Shaffer, B. (2009). Energy politics. University of Pennsylvania Press.

Dyfyniad Arddull Chicago

Shaffer, Brenda. Energy Politics. Philadelphia: University of Pennsylvania Press, 2009.

Dyfyniad MLA

Shaffer, Brenda. Energy Politics. University of Pennsylvania Press, 2009.

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