References
- De Vries HA: Evaluation of static stretching procedures for improvement of flexibility. Res Q Am Assoc Health Phys Educ 33: 222, 1962
- De Vries HA: Physiology of Exercise for Physical Education and Athletics. Edition 2. Dubuque, IA, WC Brown Co, 1974, p437
- Daniels L, Worthingham C: Therapeutic Exercise for Body Alignment and Function. Edition 2. Philadelphia, WB Saunders Co, 1977
- Departments of the Army and Air Force: Joint Motion Measurement. Technical Manual No. 8–640. Air Force Pamphlet No. 160-14-1. Washington, DC, 1956