“Diseases You Almost Forgot About (Thanks to Vaccines).” CDC, 2 August 2019, https://www.cdc.gov/vaccines/parents/diseases/diseases-forgot.html. Accessed on 3 November 2019.
“The anti-vaccination movement.” Measles Rubella Initiative, 2018, https://measlesrubellainitiative.org/anti-vaccination-movement/. Accessed on 3 November 2019.