1. Simons D, Travell J, Simons L. Travell & Simons’s myofascial pain and dysfunction: the trigger point manual, vol. 1, second edition. William & Wilkins, Baltimore. 1999.
2. Baldry P. Acupuncture, Trigger Points and Musculoskeletal Pain. Second Edition. Churchill Livingstone, Longman Group UK limited, Harcourt Publishers Limited, Edinburgh 1993.
3. Fleckenstein J. Epidemiology. In: Irnish D (ed). Myofascial trigger points, comprehensive diagnosis and treatment. E-Book, 1st edition. Churchill Livingstone. 2013.
4. Baldry P. Myfascial Pain and Fibromyalgia Syndromes. A clinical Guide to Diagnosis and Management. Churchill Livingstone, Harcourt Publishers Limited, London 2001.
5. Cummings M, Baldry P. Regional myofascial pain: diagnosis and management. Best Pract Res Clin Rheumatol 2007; 21: 367–387.