Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (9a ed.)

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