1. The Global Burden of Headache: A Documentation of Headache Prevalence and Disability Worldwide
2. McCrory DC, Penzien DB, Hasselblad V, Gray RN. Evidence Report: Behavioral and Physical Treatments for Tension-Type and Cervicogenic Headache. 1st ed. DesMoines: Foundation for Chiropractic Education and Research. 2001:2085.
3. Hugh MP, Richard H, George L, Rosa S. Acupuncture Research: Strategies for Establishing an Evidence Base. 1st ed. London: Churchill Livingstone. 2007:195-8.
4. Acupuncture for the prevention of tension?type headache [Internet] 2016. [cited 2017 May 1] Available from: URL: https://www.cochranelibrary.com/cdsr/doi/10.1002/14651858.CD007587.pub2/full