Young, K., P. White, and W. McTeer. 1994. Body talk: Male athletes reflect on sport, injury, and pain. Sociology of Sport Journal 11(2):175-194.
Zhang, L., L. D. Ravdin, N. Relkin, R. D. Zimmerman, B. Jordan, W. E. Lathan, and A. M. Ulug. 2003. Increased diffusion in the brain of professional boxers: A preclinical sign of traumatic brain injury. American Journal of Neuroradiology 24(1):52-57.
Zhang, L., L. A. Heier, R. D. Zimmerman, B. Jordan, and A. M. Ulug. 2006. Diffusion anisotropy changes in the brains of professional boxers. American Journal of Neuroradiology 27(9):2000-2004.