Cita APA (7a ed.)

Marriott, E. (2012). I used to know that world history: Intriguing facts about the world's greatest empires, leaders, cultures, and conflicts. A Reader's Digest Book.

Cita Chicago Style (17a ed.)

Marriott, Emma. I Used to Know That World History: Intriguing Facts About the World's Greatest Empires, Leaders, Cultures, and Conflicts. New York: A Reader's Digest Book, 2012.

Cita MLA (9a ed.)

Marriott, Emma. I Used to Know That World History: Intriguing Facts About the World's Greatest Empires, Leaders, Cultures, and Conflicts. A Reader's Digest Book, 2012.