1. American Psychiatric Association: Diagnostic and Statistical Manual of Mental Disorders (DSM-IV). Washington, American Psychiatric Association, 1994.
2. Meyer W 3rd, Bockting W, Cohen-Kettenis P, Coleman E, DiCeglie D, Devor H, Gooren L, Hage JJ, Kirk S, Kuiper B, Laub D, Lawrence A, Menard Y, Patton J, Schaefer L, Webb A, Wheeler CC: The standards of care for gender identity disorders - sixth version. IJT 2001;5, http://www.symposion.com/ijt/soc_2001/index.htm.
3. Becker S, Bosinski HAG, Clement U, Eicher W, Goerlich T, Hartmann U, Kockott G, Langer D, Preuss W, Schmidt G, Springer A, Wille R: German standards for the treatment and diagnostic assessment of transsexuals. IJT 1998;2, http://www.symposion.com/ijt/ijtc0603.htm.
4. Cross-cultural approaches to transsexualism.