APA citiranje

Clark, J. G. (1990). The political economy of world energy: A twentieth-century perspective. New York: Harvester Wheatsheaf.

Trích dẫn kiểu Chicago

Clark, John G. The Political Economy of World Energy: A Twentieth-century Perspective. New York: Harvester Wheatsheaf, 1990.

MLA citiranje

Clark, John G. The Political Economy of World Energy: A Twentieth-century Perspective. New York: Harvester Wheatsheaf, 1990.