APA (7th ed.) Citation

Mills, W. C. (2013). The League: The true story of average Americans on the hunt for WWI spies. Skyhorse Publ.

Chicago Style (17th ed.) Citation

Mills, William C. The League: The True Story of Average Americans on the Hunt for WWI Spies. New York: Skyhorse Publ, 2013.

MLA (9th ed.) Citation

Mills, William C. The League: The True Story of Average Americans on the Hunt for WWI Spies. Skyhorse Publ, 2013.

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