Tolong jelaskan mengenai References dari Ma Barker

Hornberger, Francine (2002) Mistresses of Mayhem: The Book of Women Criminals Alpha, Indianapolis, IN,

Hamilton, Sue, and Hamilton, John (1989) Public Enemy Number One: The Barkers Abdo and Daughters, Bloomington, MN,

Winter, Robert (2000) Mean Men: The Sons of Ma Barker Routledge, Danbury, Connecticut,

deFord, Miriam Allen (1970) The Real Ma Barker: Mastermind of a Whole Family of Killers Ace, New York

Morton, James (2012) The Mammoth Book of Gangs Running Press Book Publishers, Philadelphia, PA,

Perkins; Jack; Drummond, John; and Cara, Mark (1996) Ma Barker Crime Family Values (television documentary on VHS tape) A & E Home Video, New York,

Federal Bureau of Investigation. Barker-Karpis Gang (summary). Washington: GPO, 1937. <http://foia.fbi.gov/filelink.html?file=/barksumm/barksum1.pdf>