Cita APA (7a ed.)

Childe, G. (1946). What happened in history (1st American edition.). Penguin Books.

Cita Chicago Style (17a ed.)

Childe, Gordon. What Happened in History. 1st American edition. New York: Penguin Books, 1946.

Cita MLA (9a ed.)

Childe, Gordon. What Happened in History. 1st American edition. Penguin Books, 1946.