APA (7th ed.) Citation

-. The world book encyclopedia, volume 4 (Ci-Cz). World Book, Inc.

Chicago Style (17th ed.) Citation

-. The World Book Encyclopedia, Volume 4 (Ci-Cz). World Book, Inc.

MLA (8th ed.) Citation

-. The World Book Encyclopedia, Volume 4 (Ci-Cz). World Book, Inc.

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