APA (7th ed.) Zitazioa

Willrich, M. (1975). Energy and World politics,. Free Pr.

Chicago Style (17th ed.) Zitazioa

Willrich, Mason. Energy and World Politics,. New York: Free Pr, 1975.

MLA (9th ed.) Zitazioa

Willrich, Mason. Energy and World Politics,. Free Pr, 1975.