1. Holtkamp? N, Kolbe? A, Beleche? T. COVID-19 Vaccination Associated With Reductions in COVID-19 Mortality and Morbidity in the United States, and an Approach to Valuing These Benefits. Office of the Assistant Secretary for Planning and Evaluation, US Dept of Health and Human Services; December 15, 2021. https://aspe.hhs.gov/reports/economic-health-benefits-covid-19-vaccination
2. Kaiser Family Foundation. U.S. international COVID-19 vaccine donations tracker. Updated December 14, 2021. Accessed December 14, 2021. https://www.kff.org/coronavirus-covid-19/issue-brief/u-s-international-covid-19-vaccine-donations-tracker/
3. US Department of State. Foreign assistance for coronavirus (COVID-19). Accessed December 14, 2021. https://www.state.gov/foreign-assistance-for-coronavirus-covid-19/