Hershman, E. B.; Anderson, R; Bergfeld, J. A.; Bradley, J. P.; Coughlin, M. J.; Johnson, R. J.; Spindler, K. P.; Wojtys, E; Powell, J. W.; National Football League Injury Safety Panel; Casolaro, M. A.; Mayer, T.; Pellman, E.; Tessendorf, W.; Tucker, A. (2012). "An analysis of specific lower extremity injury rates on grass and Field Turf playing surfaces in National Football League Games: 2000–2009 seasons". The American Journal of Sports Medicine. 40 (10): 2200–5. doi:10.1177/0363546512458888. PMID22972855. S2CID35714533.
Hershman, E. B.; Anderson, R; Bergfeld, J. A.; Bradley, J. P.; Coughlin, M. J.; Johnson, R. J.; Spindler, K. P.; Wojtys, E; Powell, J. W.; National Football League Injury Safety Panel; Casolaro, M. A.; Mayer, T.; Pellman, E.; Tessendorf, W.; Tucker, A. (2012). "An analysis of specific lower extremity injury rates on grass and Field Turf playing surfaces in National Football League Games: 2000–2009 seasons". The American Journal of Sports Medicine. 40 (10): 2200–5. doi:10.1177/0363546512458888. PMID22972855. S2CID35714533.
Hershman, E. B.; Anderson, R; Bergfeld, J. A.; Bradley, J. P.; Coughlin, M. J.; Johnson, R. J.; Spindler, K. P.; Wojtys, E; Powell, J. W.; National Football League Injury Safety Panel; Casolaro, M. A.; Mayer, T.; Pellman, E.; Tessendorf, W.; Tucker, A. (2012). "An analysis of specific lower extremity injury rates on grass and Field Turf playing surfaces in National Football League Games: 2000–2009 seasons". The American Journal of Sports Medicine. 40 (10): 2200–5. doi:10.1177/0363546512458888. PMID22972855. S2CID35714533.