APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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

Warning: These citations may not always be 100% accurate.