Cita APA (7th ed.)

Childe, V. G. (1942). What happened in history. Penguin Books.

Cita Chicago (17th ed.)

Childe, Vere Gordon. What Happened in History. Londres: Penguin Books, 1942.

Cita MLA (9th ed.)

Childe, Vere Gordon. What Happened in History. Penguin Books, 1942.