Psychopathia sexualis; eine klinisch-forensische Studie.

Krafft-Ebing revised the book through 12 editions. Digital facsimile of the first edition from wellcomecollection.org at this link. English translation as Psychopathia sexualis, with special reference to contrary sexual instinct: A medico-legal study. Authorized translation of the seventh enlarged and revised German edition by Charles Gilbert Chaddock (Philadelphia: F. A. Davis Company, 1894). Digital facsimile of the 1894 edition from Google Books at this link. (The author's full name was Richard Fridolin Joseph Freiherr Krafft von Festenberg auf Frohnberg, genannt von Ebing.)