1. The transsexual phenomenon;Benjamin,1966
2. Diagnostic Criteria for Research;Geneve: WHO,1993
3. Harry Benjamin International Gender Dysphoria Association's The Standards of Care for Gender Identity Disorders (5th version);Levine;http://www.tc.umn.edu/nlhome/m201/colem001/hbigda/hstndrd.htm,1998
4. Harry Benjamin International Gender Dysphoria Association's The Standards of Care for Gender Identity Disorders (6th version);Meyer;IJT,2001