Mattacola, C. G., Lebsack, D. A., & Perrin, D. H. (1995). Intertester reliability of assessing postural sway using the Chattecx Balance System. Journal of athletic training, 30(3), S. 237-242. http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1317868/pdf/jathtrain00023-0047.pdf

Mattacola, Carl G., Denise A. Lebsack, and David H. Perrin. "Intertester Reliability of Assessing Postural Sway Using the Chattecx Balance System." Journal of Athletic Training 30, no. 3 (1995): S. 237-242.

Mattacola, Carl G., Denise A. Lebsack, and David H. Perrin. "Intertester Reliability of Assessing Postural Sway Using the Chattecx Balance System." Journal of Athletic Training 30.3 (1995): S. 237-242.