Cita APA

Childe, V. G., & Clark, G. (1942). What happened in history. Penguin books.

Citación estilo Chicago

Childe, V. Gordon, and Grahame Clark. What Happened in History. Baltimore: Penguin books, 1942.

Cita MLA

Childe, V. Gordon, and Grahame Clark. What Happened in History. Penguin books, 1942.

Warning: These citations may not always be 100% accurate.