Cita APA (7th ed.)

Foley, G. (1981). The energy question (2nd ed.). Penguin.

Cita Chicago (17th ed.)

Foley, Gerald. The Energy Question. 2nd ed. Harmondsworth, Middlesex: Penguin, 1981.

Cita MLA (9th ed.)

Foley, Gerald. The Energy Question. 2nd ed. Penguin, 1981.