Cita APA (7th ed.)

THE WORLD BOOK.. (2007). The world book encyclopedia A volume 1. World Book.

Cita Chicago (17th ed.)

THE WORLD BOOK.. The World Book Encyclopedia A Volume 1. Chicago: World Book, 2007.

Cita MLA (9th ed.)

THE WORLD BOOK.. The World Book Encyclopedia A Volume 1. World Book, 2007.