Cita APA (7th ed.)

World Book, Inc. (2011). The World Book encyclopedia. World Book.

Cita Chicago (17th ed.)

World Book, Inc. The World Book Encyclopedia. Chicago: World Book, 2011.

Cita MLA (9th ed.)

World Book, Inc. The World Book Encyclopedia. World Book, 2011.

Atenció: Aquestes cites poden no estar 100% correctes.