APA (7th ed.) Citation

THE WORLD BOOK ENCYCLOPEDIA.. (1989). The world book encyclopedia: I. World Book.

Chicago Style (17th ed.) Citation

THE WORLD BOOK ENCYCLOPEDIA.. The World Book Encyclopedia: I. Chicago: World Book, 1989.

MLA (9th ed.) Citation

THE WORLD BOOK ENCYCLOPEDIA.. The World Book Encyclopedia: I. World Book, 1989.

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