Willrich, M. (1975). Energy and world politics. Collier Macmillan.
Cita Chicago (17th ed.)Willrich, Mason. Energy and World Politics. Collier Macmillan, 1975.
Cita MLA (9th ed.)Willrich, Mason. Energy and World Politics. Collier Macmillan, 1975.
Atenció: Aquestes cites poden no estar 100% correctes.