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"John Pizer". casebook.org. 1 January 2010. Archived from the original on 24 November 2020. Retrieved 1 June 2020.
Ignacio Peyro (29 October 2018). "Who Was Jack the Ripper?". nationalgeographic.co.uk. Archived from the original on 31 March 2021. Retrieved 1 June 2020.
"The Whitechapel Murders". Western Mail. 17 November 1888. Archived from the original on 2 December 2020. Retrieved 9 February 2020.
Evans, Stewart P. (April 2003). "Ripperology, A Term Coined By ...", Ripper Notes, copies at Wayback and CasebookArchived 16 October 2011 at the Wayback Machine
Keppel, Robert D.; Weis, Joseph G.; Brown, Katherine M.; Welch, Kristen (2005), "The Jack the Ripper murders: a modus operandi and signature analysis of the 1888–1891 Whitechapel murders", Journal of Investigative Psychology and Offender Profiling, 2 (1): 1–21, doi:10.1002/jip.22, ISSN1544-4759