Cita APA (7th ed.)

Foley, G., & Nassim, C. (1976). The energy question. Penguin.

Cita Chicago (17th ed.)

Foley, Gerald, i Charlotte Nassim. The Energy Question. Harmondsworth: Penguin, 1976.

Cita MLA (9th ed.)

Foley, Gerald, i Charlotte Nassim. The Energy Question. Penguin, 1976.