Kelly, J. P., Nichols, J. S., Filley, C. M., Lillehei, K. O., Rubinstein, D., & Kleinschmidt-DeMasters, B. (1991). Concussion in sports. Guidelines for the prevention of catastrophic outcome. Journal of the American Medical Association, 266, S. 2867-2869.

Kelly, James P., John S. Nichols, Christopher M. Filley, Kevin O. Lillehei, David Rubinstein, and B.K Kleinschmidt-DeMasters. "Concussion in Sports. Guidelines for the Prevention of Catastrophic Outcome." Journal of the American Medical Association 266 (1991): S. 2867-2869.

Kelly, James P., et al. "Concussion in Sports. Guidelines for the Prevention of Catastrophic Outcome." Journal of the American Medical Association 266 (1991): S. 2867-2869.