1. Sweigard, L E. 1974.Human Movement Potential3New York: Dodd, Mead & Company.
2. Todd, M E. 1937.The Thinking Body: A Study of the Balancing Forces of Dynamic Man76Princeton: Princeton Book Company.
3. Todd, M E. 1937. 35
4. Sweigard. 1974. 5
5. Rasch, P J and Burke, R K. 1974.Kinesiology and Applied Anatomy486Philadelphia: Lea & Febiger.