WilliamW.BeadleWilliamW., Jack the Ripper: Unmasked, London: John Blake,, London: John Blake, 2009, s. 75, ISBN 978-1-84454-688-6, OCLC267221756.
David VD.V.CanterDavid VD.V., Criminal Shadows: Inside the Mind of the Serial Killer, London: HarperCollins, London: HarperCollins, 1994, s. 12–13, ISBN 0-00-255215-9, OCLC29885184.