1. Barker, M. (2014). Non-binary genders. Rewriting the rules.Retrieved from http://rewritingtherules.wordpress.com /2014/06/04/non-binary-genders-talk [Accessed 1 August 2014].
2. Bornstein, K. & Bergman, S. B. (Eds.) (2010). Gender outlaws: The next generation.New York: Avalon Publishing Group.
3. Fausto-Sterling, A. (2012). Sex/gender: Biology in a social world.New York, NY: Routledge.
4. Richards, C. & Barker, M. (Eds.) (2013). Sexuality and gender for mental health professionals: A practical guide.London: Sage.
5. Richards, C., Bouman, W. R, & Barker, M. (forthcoming). Non-binary genders.London: Pal grave Macmillan.