Cita APA (7a ed.)
Childe, V. G. (1942). What happened in history. Penguin Books.
Cita Chicago Style (17a ed.)
Childe, V. Gordon. What Happened in History. Harmondsworth, Middlesex, U.K.: Penguin Books, 1942.
Cita MLA (9a ed.)
Childe, V. Gordon. What Happened in History. Penguin Books, 1942.
警告：這些引文格式不一定是100％准確.