Sinus Headache: References

Sinus headaches. Cleveland Clinic. http://my.clevelandclinic.org/health/diseases_conditions/hic_Overview_of_Headaches_in_Adults/hic_Sinus_Headaches. Updated February 1, 2012. Accessed August 2013.

Sinus headaches. American Academy of Otolaryngology – Head and Neck Surgery. http://www.entnet.org/content/sinus-headaches. Accessed August 2016.

Distinguishing sinus headache from migraine. National Headache Foundation. http://www.headaches.org/?s=sinus+headache. Accessed July 2016.