Cita APA (7th ed.)

Childe, G. (1943). What Happened in History (2. Aufl.). Penguin.

Cita Chicago (17th ed.)

Childe, Gordon. What Happened in History. 2. Aufl. Harmondsworth: Penguin, 1943.

Cita MLA (8th ed.)

Childe, Gordon. What Happened in History. 2. Aufl. Penguin, 1943.