Reference
- Norris FH Jr. As quoted in: Burkee GL. Backache from occiput to coccyx. Vancouver, BC: WEG MacDonald, 1964: 62
References
- Travell J, Simons DG. Myofascial pain and dysfunction: the trigger point manual. Baltimore: Williams & Wilkins, 1983
- Travell J, Rinziier SH. The myofascial genesis of pain. Postgrad Med 1952: 11(5): 425–34
- Simons DG. Muscle pain syndromes. Amer J Phys Med 1975: 54: 289–311 (pt I): 1976: 55: 15–12 (pt II)