Cita APA (7th ed.)

World Book, I. (1999). The world book encyclopedia: N-o. World Book.

Cita Chicago (17th ed.)

World Book, Inc. The World Book Encyclopedia: N-o. Chicago: World Book, 1999.

Cita MLA (9th ed.)

World Book, Inc. The World Book Encyclopedia: N-o. World Book, 1999.