1. Allen, C. (1962).A Textbook of Psychosexual Disorders. Oxford University Press, London.
2. Bancroft, J. (1972). The relationship between gender identity and sexual behavior?some clinical aspects. In Ounsted, C., and Taylor, D.C. (eds.),Gender Differences?Their Ontogeny and Significance Churchill Livingstone, London.
3. Buhrich, N., and McConaghy, N. (1977). The discrete syndromes of transvestism and transsexualism.Arch. Sex. Behav. 6: 483?495.
4. Ellis, H. (1906).Studies in the Psychology of Sex (Vol. 3). F. A. Davis, Philadelphia.
5. Ferguson-Rayport, S. M., Griffith, R. M., and Straus, E. W. (1955). The psychiatric significance of tattoos.Psychiat. Quart. 29: 112?131.