US Department of Health and Human Services. Centers for Disease control and Prevention. Rocky Mountain Spotted Fever. http://www.vaccines.gov/diseases/tetanus/. November 2013. Accessed March 2016.
US Department of Health and Human Services, Centers for Disease control and Prevention. Ticks. http://www.cdc.gov/ticks/. Updated February 2016. Accessed February 2016.
Shapiro, ED (2014) Lyme Disease. New England Journal of Medicine. 370:1724-31. DOI: 10.1056/NEJMcp1314325.
About Lyme disease. Lymedisease.org. https://www.lymedisease.org/lyme-basics/lyme-disease/about-lyme/. Accessed February 2016.