References
Barbara L. Frankowski, Sexual Orientation and Adolescents, 2004.American Academy of Pediatrics.
J. Richard Udry, "The Nature of Gender" Vol.31, No4. Population Association of America . http://www.jstor.org/stable/2061790.
Susan E. Short, PhD, Yang Claire Yang, PhD, and Tania M. Jenkins, MA,. (2013) FRAMING HEALTH MATTERS Sex, Gender, Genetics, and Health, Vol 103, No. S1 | American Journal of Public Health