Cita APA (7th ed.)
Childe, V. G. (1942). What happened in history. Penguin Books.
Cita Chicago (17th ed.)
Childe, V. Gordon. What Happened in History. Harmondsworth, Middlesex, U.K.: Penguin Books, 1942.
Cita MLA (9th ed.)
Childe, V. Gordon. What Happened in History. Penguin Books, 1942.
Atenció: Aquestes cites poden no estar 100% correctes.