Cecilia Hardacker; Kelly Ducheny; Magda Houlberg (17 October 2018). Transgender and Gender Nonconforming Health and Aging. Springer. p. 3. ISBN978-3-319-95031-0. https://books.google.com/books?id=SfhyDwAAQBAJ&pg=PA3. ""The government, society, healthcare and school systems, and the child's parents have traditionally assumed that all children with a female sex assigned at birth will grow up to be women and all children with a male sex assigned at birth will grow up to be men. It has been assumed that people are cisgender, in other words, that people's sex assigned at birth was automatically identical to their gender identity - which is their personal felt experience of gender, of being male, female, a combination of male and female, or a unique blend of those genders. It was also assumed that gender was binary and that there are only two ways to experience gender either as a girl/woman or as a boy/man.""
Reiner WG (2002). “Gender identity and sex assignment: a reappraisal for the 21st century”. Adv. Exp. Med. Biol.. Advances in Experimental Medicine and Biology 511: 175–89; discussion 189–97. doi:10.1007/978-1-4615-0621-8_11. ISBN978-1-4613-5162-7. PMID12575762.
Byne, William; Karasic, Dan H.; Coleman, Eli; Eyler, A. Evan; Kidd, Jeremy D.; Meyer-Bahlburg, Heino F.L.; Pleak, Richard R.; Pula, Jack (2018). “Assessment and Treatment of Gender Dysphoria and Gender Variant Patients: A Primer for Psychiatrists”. American Journal of Psychiatry175 (10): 1046–1046. doi:10.1176/appi.ajp.2018.1751002. ISSN0002-953X.
Reiner WG (2002). “Gender identity and sex assignment: a reappraisal for the 21st century”. Adv. Exp. Med. Biol.. Advances in Experimental Medicine and Biology 511: 175–89; discussion 189–97. doi:10.1007/978-1-4615-0621-8_11. ISBN978-1-4613-5162-7. PMID12575762.
Byne, William; Karasic, Dan H.; Coleman, Eli; Eyler, A. Evan; Kidd, Jeremy D.; Meyer-Bahlburg, Heino F.L.; Pleak, Richard R.; Pula, Jack (2018). “Assessment and Treatment of Gender Dysphoria and Gender Variant Patients: A Primer for Psychiatrists”. American Journal of Psychiatry175 (10): 1046–1046. doi:10.1176/appi.ajp.2018.1751002. ISSN0002-953X.