Citazione Stile APA (7a Edizione)

Knoepfel, H. (1986). Energy 2000: An overview of the world's energy resources in the decades to come. Gordon and Breach Science Publishers.

Citazione stile Chigago Style (17a edizione)

Knoepfel, Heinz. Energy 2000: An Overview of the World's Energy Resources in the Decades to Come. New York [etc.]: Gordon and Breach Science Publishers, 1986.

Citatione MLA (9a ed.)

Knoepfel, Heinz. Energy 2000: An Overview of the World's Energy Resources in the Decades to Come. Gordon and Breach Science Publishers, 1986.