James, C. Y., Riemann, B. L., Munkasy, B. A., & Joyner, A. B. (2004). Comparison of cervical spine motion during application among 4 rigid immobilization collars. Journal of athletic training, 39(2), S. 138-145. http://www.ncbi.nlm.nih.gov/pmc/articles/PMC419507/

James, Colleen Y., Bryan L. Riemann, Barry A. Munkasy, and A. Barry Joyner. "Comparison of Cervical Spine Motion During Application Among 4 Rigid Immobilization Collars." Journal of Athletic Training 39, no. 2 (2004): S. 138-145.

James, Colleen Y., Bryan L. Riemann, Barry A. Munkasy, and A. Barry Joyner. "Comparison of Cervical Spine Motion During Application Among 4 Rigid Immobilization Collars." Journal of Athletic Training 39.2 (2004): S. 138-145.