Tony Thorne, Countess Dracula: The Life and Times of the Bloody Countess, Elisabeth Báthory. London: Bloomsbury, 1997
Timeline of Shootings in Montreal, The Toronto Star, 15 September 2006
Colin Wilson, The Serial Killers: A Study in the Psychology of Violence. London: Allen, 1990
— and Robin Odell, Jack the Ripper: Summing Up and Verdict. London: Bantam, 1987
Leonard Wolf, Bluebeard: The Life and Times of Gilles de Rais. New York: Potter, 1980
Morris Wolfe, Essays, New and Selected. Toronto: grubstreet, n.d
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McCord Museum: Thomas Cream
Rex: Fritz Haarmann
The World's Most Evil Psychopaths: Horrifying True-Life Cases Page 20