APA (7th ed.) Citation

L, L., AM, E., & MB, H. (2002). A series on patient safety. New England Journal of Medicine, 347(16), 1272.

Chicago Style (17th ed.) Citation

L, Leape, Epstein AM, and Hamel MB. "A Series on Patient Safety." New England Journal of Medicine 347, no. 16 (2002): 1272.

MLA (9th ed.) Citation

L, Leape, et al. "A Series on Patient Safety." New England Journal of Medicine, vol. 347, no. 16, 2002, p. 1272.