1892: Dr, Richard von Krafft-Ebing, Psychopathia Sexualis (Chaddock translation)

1892: Dr. Richard von Krafft-Ebing, Psychopathia Sexualis, with Special Reference to Contrary Sexual Instinct, A Medicu-Legal Study, translation of the seventh German edition by Charles Gilbert Chaddock, M.D. (Philadelphia and London: F. A. Davis Company, 1892).

References to "hetero-sexual" and "homo-sexual" to be added.