APA (7th ed.) Citation

Somervill, B. A. (2006). The history of the calendar. Child's World.

Chicago Style (17th ed.) Citation

Somervill, Barbara A. The History of the Calendar. Chanhassen, Minn.: Child's World, 2006.

MLA (8th ed.) Citation

Somervill, Barbara A. The History of the Calendar. Child's World, 2006.

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