Bailes, J. E., & Hudson, V. (2001). Classification of sport-related head trauma: A spectrum of mild to severe injury. Journal of athletic training, 36(3), S. 236-243. http://www.ncbi.nlm.nih.gov/pmc/articles/PMC155412/

Bailes, Julian E., and Vincent Hudson. "Classification of Sport-related Head Trauma: A Spectrum of Mild to Severe Injury." Journal of Athletic Training 36, no. 3 (2001): S. 236-243.

Bailes, Julian E., and Vincent Hudson. "Classification of Sport-related Head Trauma: A Spectrum of Mild to Severe Injury." Journal of Athletic Training 36.3 (2001): S. 236-243.