Breman, Joel (2016). Donald Ainslie Henderson (1928–2016) Epidemiologist who led the effort to eradicate smallpox. Nature. London: Springer Nature. 538 (7623): 42—42. doi:10.1038/538042a. PMID27708300.
Statement of Tommy G. Thompson: Secretary, Department of Health and Human Services. US House of Representatives Committee on Energy and Commerce. Washington, DC: Assistant Secretary for Legislation, Department of Health and Human Services; 2015. http://www.hhs.gov/asl/testify/t011115.html [Архівовано 4 листопада 2016 у Wayback Machine.]. Retrieved September 17, 2015.
Breman, Joel (2016). Donald Ainslie Henderson (1928–2016) Epidemiologist who led the effort to eradicate smallpox. Nature. London: Springer Nature. 538 (7623): 42—42. doi:10.1038/538042a. PMID27708300.
Statement of Tommy G. Thompson: Secretary, Department of Health and Human Services. US House of Representatives Committee on Energy and Commerce. Washington, DC: Assistant Secretary for Legislation, Department of Health and Human Services; 2015. http://www.hhs.gov/asl/testify/t011115.html [Архівовано 4 листопада 2016 у Wayback Machine.]. Retrieved September 17, 2015.