Agel, J., Ransone, J., Dick, R., Oppliger, R., & Marshall, S. W. (2007). Descriptive epidemiology of collegiate men's wrestling injuries: National Collegiate Athletic Association Injury Surveillance System, 1988–1989 through 2003–2004. Journal of athletic training, 42(2), S. 303-310. http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1941299/

Agel, Julie, Jack Ransone, Randall Dick, Robert Oppliger, and Stephen W. Marshall. "Descriptive Epidemiology of Collegiate Men's Wrestling Injuries: National Collegiate Athletic Association Injury Surveillance System, 1988–1989 Through 2003–2004." Journal of Athletic Training 42, no. 2 (2007): S. 303-310.

Agel, Julie, et al. "Descriptive Epidemiology of Collegiate Men's Wrestling Injuries: National Collegiate Athletic Association Injury Surveillance System, 1988–1989 Through 2003–2004." Journal of Athletic Training 42.2 (2007): S. 303-310.