Cita APA (7a ed.)

Childe, V. G., & Clark, G. (1982). What happened in history. Penguin Books.

Cita Chicago Style (17a ed.)

Childe, Vere Gordon, y Grahame Clark. What Happened in History. Harmondsworth: Penguin Books, 1982.

Cita MLA (9a ed.)

Childe, Vere Gordon, y Grahame Clark. What Happened in History. Penguin Books, 1982.