APA (7th ed.) Citation

JM, L., & WJ, B. (2002). Smallpox and smallpox vaccination. New England Journal of Medicine, 347(9), 691.

Chicago Style (17th ed.) Citation

JM, Lane, and Bicknell WJ. "Smallpox and Smallpox Vaccination." New England Journal of Medicine 347, no. 9 (2002): 691.

MLA (9th ed.) Citation

JM, Lane, and Bicknell WJ. "Smallpox and Smallpox Vaccination." New England Journal of Medicine, vol. 347, no. 9, 2002, p. 691.