1. The Transsexual Phenomenon;Benjamin,1966
2. Bisexuality, A Study;Wolff,1977
3. Royal College of Psychiatrists. Good practice guidelines for the assessment and treatment of adults with gender dysphoria. 2013. Available at: http://www.rcpsych.ac.uk/files/pdfversion/CR181.pdf. Accessed August 30, 2013.
4. Green R. Human Sexuality. Baltimore, MD: Williams and Wilkins; 1979.
5. Intonation and fundamental frequency in male-to-female transsexuals;Wolfe;J Speech Hear Disord,1990