APA (7th ed.) Citation

(1992). The World Book Encyclopedia: Volume 20 ( U-V ). World Book, Inc..

Chicago Style (17th ed.) Citation

The World Book Encyclopedia: Volume 20 ( U-V ). London: World Book, Inc., 1992.

MLA (9th ed.) Citation

The World Book Encyclopedia: Volume 20 ( U-V ). World Book, Inc., 1992.

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