Due to the unusual era and location of the crimes, there are consequently very few books with detailed information on Fritz Haarmann.

Bolitho, W. Murder for Profit (1926);

Lessing, T. Monsters of Weimar: Haarmann — The Story of a Werewolf (1993);

Marriner, B. A New Century of Sex Killers (1992);

Wilson, C. and D. World Famous Serial Killers (1992);

Information may also be obtained at the following web-sites:

www.fortunecity.com Discussions of the 'Modus Operandi' of murderers

www.mayhem.net General information on notorious killers

www.tdl.com The "Scratching Post Crime Archives"

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