1. The state of the antivaccine movement in the United States: A focused examination of nonmedical exemptions in states and counties
2. Texas and Its Measles Epidemics
3. Measles cases in 2019. Centers for Disease Control and Prevention Web Site. https://www.cdc.gov/measles/cases-outbreaks.html Updated April 11, 2019. Accessed April 19, 2019
4. Vaccination Coverage Among Children Aged 19–35 Months — United States, 2017
5. Downs C. 45,000 Texan students requested conscientious exemptions from vaccinations in 2018. San Antonio Express-News. March 16, 2019. https://www.mysanantonio.com/news/education/article/76-000-Texan-students-requested-conscientious-13685867.php Accessed April 12, 2019