Helmer, W., & Bilek, A. J. (2004). The St. Valentine's Day massacre: The untold story of the gangland bloodbath that brought down Al Capone. Cumberland House.
Chicago Style (17th ed.) CitationHelmer, William, and Arthur J. Bilek. The St. Valentine's Day Massacre: The Untold Story of the Gangland Bloodbath That Brought Down Al Capone. Nashville, Tenn: Cumberland House, 2004.
MLA (8th ed.) CitationHelmer, William, and Arthur J. Bilek. The St. Valentine's Day Massacre: The Untold Story of the Gangland Bloodbath That Brought Down Al Capone. Cumberland House, 2004.
Warning: These citations may not always be 100% accurate.