Cita APA (7a ed.)

World Book, I. (1996). The world book encyclopedia: W- x-y-z. World Book.

Cita Chicago Style (17a ed.)

World Book, Inc. The World Book Encyclopedia: W- X-y-z. Chicago: World Book, 1996.

Cita MLA (9a ed.)

World Book, Inc. The World Book Encyclopedia: W- X-y-z. World Book, 1996.