APA (7th ed.) Citation

Childe, V. G. (1952). What happened in history. Penguin Books.

Chicago Style (17th ed.) Citation

Childe, V. Gordon. What Happened in History. Harmondsworth, Middlesex, England: Penguin Books, 1952.

MLA (9th ed.) Citation

Childe, V. Gordon. What Happened in History. Penguin Books, 1952.