APA (7th ed.) Citation

World Book (Chicago). (1989). The world book encyclopedia of science (Second 1989 printing.). World Book.

Chicago Style (17th ed.) Citation

World Book (Chicago). The World Book Encyclopedia of Science. Second 1989 printing. Chicago: World Book, 1989.

MLA (9th ed.) Citation

World Book (Chicago). The World Book Encyclopedia of Science. Second 1989 printing. World Book, 1989.

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