WebMD. Allergies Health Center. Sinus Infection. © 2007. Accessed 8/2010 from http://www.webmd.com/allergies/sinus-infection.
National Institute of Allergy and Infectious Disease. Sinus Infection (Sinusitis). US Dept. of Health and Human Services, National Institutes of Health, National Institute of Allergy and Infectious Diseases. Sept. 25, 2007. Accessed Aug. 31, 2009 from http://www3.niaid.nih.gov/topics/sinusitis/.