Keskula, D. R., Duncan, J. B., Davis, V. L., & Finley, P. W. (1996). Functional outcome measures for knee dysfunction assessment. Journal of athletic training, 31(2), S. 105-110. http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1318439/pdf/jathtrain00018-0011.pdf

Keskula, Douglas R., Jewell B. Duncan, Virgina L. Davis, and Paula W. Finley. "Functional Outcome Measures for Knee Dysfunction Assessment." Journal of Athletic Training 31, no. 2 (1996): S. 105-110.

Keskula, Douglas R., Jewell B. Duncan, Virgina L. Davis, and Paula W. Finley. "Functional Outcome Measures for Knee Dysfunction Assessment." Journal of Athletic Training 31.2 (1996): S. 105-110.