APA (7th ed.) Zitazioa
Shaffer, B. (2009). Energy politics. University of Pennsylvania Press.
Chicago Style (17th ed.) Zitazioa
Shaffer, Brenda. Energy Politics. Philadelphia: University of Pennsylvania Press, 2009.
MLA (9th ed.) Zitazioa
Shaffer, Brenda. Energy Politics. University of Pennsylvania Press, 2009.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.