1. MacPartland J. Travell trigger points-molecular and osteopathic perspectives. J Am Osteopath Assoc. 2004;104:244–9.
2. Kupfer M, Overton E. Treatment of trigger points in myofascial pain syndrome. In: Freedman M, Morrison W, Harwood M, editors. Minimally invasive musculoskeletal pain medicine. New York, NY: Informa Healthcare; 2007. p. 67–98.
3. Scott NA, Guo B, Barton PM, Gerwin RD. Trigger point injections for chronic non-malignant musculoskeletal pain: a systematic review. Pain Med. 2009;10(1):54–69.
4. Hubbard DR, Berkoff GM. Myofascial Trigger point how spontaneous needle EMG activity. Spine. 1993;18:1803–7.
5. Weiss L, Silver J, Lennard T, Weiss J. Easy injections. Philadelphia, PA: Butterworth-Heinemann Elsevier; 2007.