Todd, F. N., Lamoreux, L. W., Skinner, S. R., Johanson, M. E., Helen, R. S., Moran, S. A., & Ashley, R. K. (1989). Variations in the gait of normal children. Journal of bone and joint surgery / A, American volume, 71(2), S. 196-204.

Todd, Frank N., Larry W. Lamoreux, Stephen R. Skinner, M. Elise Johanson, Roger St Helen, Sally A. Moran, and R. Kirklin Ashley. "Variations in the Gait of Normal Children." Journal of Bone and Joint Surgery / A, American Volume 71, no. 2 (1989): S. 196-204.

Todd, Frank N., et al. "Variations in the Gait of Normal Children." Journal of Bone and Joint Surgery / A, American Volume 71.2 (1989): S. 196-204.