APA (7th ed.) Citation

World Book, Inc. (1985). The world book encyclopedia. World Book, Inc.

Chicago Style (17th ed.) Citation

World Book, Inc. The World Book Encyclopedia. Chicago: World Book, Inc, 1985.

MLA (9th ed.) Citation

World Book, Inc. The World Book Encyclopedia. World Book, Inc, 1985.

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