Centers for Disease Control and Prevention. Meningococcal disease. https://www.cdc.gov/meningococcal/index.html. Updated June 29, 2016. Accessed September 2016.
Bacterial meningitis. Cleveland Clinic. http://my.clevelandclinic.org/disorders/Meningitis/hic_Bacterial_Meningitis.aspx. Updated May 4, 2010.
McPhee SJ, Papadakis MA, Eds. Current Medical Diagnosis and Treatment. 50th ed. McGraw-Hill, 2011. Accessed September 2016.
US National Library of Medicine. PubMed Health. http://www.ncbi.nlm.nih.gov/pubmedhealth/PMHT0024782/. Accessed September 2016.