APA (7th ed.) Citation

Heymann, D. L., & Wilder-Smith, A. (2020). Successful smallpox eradication: What can we learn to control COVID-19? Journal of travel medicine, 27(4), . https://doi.org/10.1093/jtm/taaa090

Chicago Style (17th ed.) Citation

Heymann, David L., and Annelies Wilder-Smith. "Successful Smallpox Eradication: What Can We Learn to Control COVID-19?" Journal of Travel Medicine 27, no. 4 (2020). https://doi.org/10.1093/jtm/taaa090.

MLA (9th ed.) Citation

Heymann, David L., and Annelies Wilder-Smith. "Successful Smallpox Eradication: What Can We Learn to Control COVID-19?" Journal of Travel Medicine, vol. 27, no. 4, 2020, https://doi.org/10.1093/jtm/taaa090.