1. American National Election Studies. (2015). User’s guide and codebook for the ANES 2012 Time Series Study. Retrieved on December 14, 2019 from https://electionstudies.org/wp-content/uploads/2012/02/anes_timeseries_2012_userguidecodebook.pdf.
2. Anderson, D., & Stone, G. P. (1981). Responses of male and female metropolitans to the commercialization of professional sport 1960 to 1975. International Review of Sport Sociology, 16(3), 5–20. https://doi.org/10.1177/101269028101600301.
3. Anderson, E., & Travers, A. (2017). Transgender athletes in competitive sport. New York: Routledge. https://doi.org/10.4324/9781315304274.
4. Atkinson, M. (2009). Openly gay athletes. In M. Atkinson (Ed.), Battleground sports (pp. 295–300). Westport, CT: Greenwood Press.
5. Babb, K. (2017). Transgender wrestler Mack Beggs identifies as a male. He just won the Texas state girls title. Washington Post. Retrieved on August 14, 2019 from https://www.washingtonpost.com/sports/highschools/meet-the-texas-wrestler-who-won-a-girls-state-title-his-name-is-mack/2017/02/25/982bd61c-fb6f-11e6-be05-1a3817ac21a5_story.html?utm_term=.df093da0886b