I haven't read any of these but thought you might be able to add a few to your reading list. Hope they help. :)
1) "The Diary of Jack the Ripper" by Shirley Harrison
2) "The Crimes of Jack the Ripper" by Paul Roland
3) "The Crimes, Detection and Death of Jack the Ripper" Martin Fido
4) "The Complete Jack the Ripper" by Donald Rumbelow
5) "The Complete History of Jack the Ripper" by Philip Sudgen
6) "Catherine Eddows: Jack the Ripper victim" by Neal Sheldon
7) "Catch me if you can" by Leanne Perry
8) "A Casebook on Jack the ripper" by Richard Whittington-Egan
9) "Alias Jack the Ripper: beyond the usual whitechapel suspects" by R. Michael Gordon
10) "L'Affaire Jack l'Eventreur" by Christian Coudurier
11) "Yours Truly, Jack the Ripper" by Patrick Prior
12) "Jack the Ripper: The Casebook" by Richard Jones
13) "Jack the Ripper: The Forgotten Victims" by Paul Begg
14) "A Tale from Ripper Street: Inspecter Edmund" by Joseph Busa
15) "Portrait of a Killer: Jack the Ripper-Case" by Patricia Cornwell
16) "Jack the Ripper Unmasked: Murder case files" by Neil Ashford
17) "Jack the Ripper's Streets of Terror: Life during the reign of Victorian London's Most Brutal Killer" by Rupert Matthews
18) "Jack the Ripper and the Case for Scotland Yard" by Robert House
19) "Jack the Ripper The Suspects" by Whitechapel society
20) "Capturing Jack the ripper: in the boots of a Bobby in Victorian England" by Neil Bell
21) "The Mammoth Book of Jack the Ripper" by Maxim Jakubowski
22) "The London of Jack the Ripper: Then and Now" by Robert Clack
23) "Stalking Jack: the hunt begins" by Madison Kent
24) "1888: A Jack the Ripper Novel" by Charlie Revelle-Smith
25) "Jack the Ripper: the simple truth" by Burce Paley
26) "The Jack the Ripper: location photographs" by Philp Hutchinson
27) "Jack the Ripper, The murder, the mystery" by Victor Stapleton
28) "Jack the Ripper-the secret police files" by Trevor Marriott
29) "Jack the Ripper: Quest for a Killer" by M J Trow
30) "Naming Jack the Ripper" by Russell Edwards
31) "Sexual Psychopaths: British serial killers" by David Malocco
32) "Prisoner 1167: The madman who was Jack the Ripper" by James C. H. Tully
33) "Rippe" by Stefan Petrucha
34) "The Conan Doyle Notes: secret of Jack the Ripper" by Diane Madsen
35) "The Lodger" by Mary Belloc
36) "Jack the Ripper: Scotland Yard Investigates" by Stewart P. Evans
37) "From Hell" by Alan Moore