1. Pennington, M. (2021, Jul). Vaccine hesitancy: a story as old as vaccines themselves. Eureka A Dose of Science. Retrieved from https://www.criver.com/eureka/vaccine-hesitancy-story-old-vaccines-themselves
2. The College of the Physicians of Philadelphia. (n.d.). The history of vaccines. Retrieved https://www.historyofvaccines.org/timeline
3. Centers for Disease Control and Prevention. (2021, March). Everything you should know about the COVD-19 vaccines [Video]. https://youtu.be/pL-B30EXBEc
4. National Institutes of Health. (2021, August). Vaccines prevented up to 140,000 COVID-19 deaths. https://www.nih.gov/news-events/nih-research-matters/vaccines-prevented-140000-covid-19-deaths-us