APA (7th ed.) Citation

Forty. (2002). World War I: A visual encyclopedia. PRC Publishing.

Chicago Style (17th ed.) Citation

Forty. World War I: A Visual Encyclopedia. London, England: PRC Publishing, 2002.

MLA (9th ed.) Citation

Forty. World War I: A Visual Encyclopedia. PRC Publishing, 2002.

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