APA (7th ed.) Citation

Clark & Cordy-Simpson. (2001). World War I: An illustrated history. Helicon Publ.

Chicago Style (17th ed.) Citation

Clark and Cordy-Simpson. World War I: An Illustrated History. Oxford: Helicon Publ, 2001.

MLA (8th ed.) Citation

Clark and Cordy-Simpson. World War I: An Illustrated History. Helicon Publ, 2001.

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