Tension Headache: References

WebMD. Tension Headache. © WebMD 2005-2011. Accessed 4/28/2011 from http://www.webmd.com/migraines-headaches/tension-headaches.

Centers for Disease Control. MedlinePlus. Tension Headache. US Department of Health and Human Services. Centers for Disease Control and Prevention. June 19, 2008. Accessed April 28, 2009 from http://www.nlm.nih.gov/medlineplus/ency/article/000797.htm.