1. Report of Trends and Participation in Organized Youth Sports. In: Sports NCoY, ed. NCYS membership survey 2008.
2. Carpenter LJ, Acosta RV. Women in intercollegiate sport: a longitudinal national study; thirty-five year update, 1977-2012. Human Kinetics. 2012.
3. High School Athletics Participation Survey. In: Associations NFoSHS, ed. 2010–2011.
4. Jansson A, Saartok T, Werner S, Renstrom P. General joint laxity in 1845 Swedish school children of different ages: age- and gender-specific distributions. Acta Paediatr. 2004;93(9):1202–6.
5. Marnach ML, Ramin KD, Ramsey PS, Song SW, Stensland JJ, An KN. Characterization of the relationship between joint laxity and maternal hormones in pregnancy. Obstet Gynecol. 2003;101(2):331–5.