APA (7th ed.) Citation

DM, G., E, C., EL, K., RG, G., & ET, H. (2007). Case 21-2007: A 58-year-old woman with headaches, weakness, and strokelike episodes. New England Journal of Medicine, 357(2), 164.

Chicago Style (17th ed.) Citation

DM, Greer, Cagliero E, Krakauer EL, Gonzalez RG, and Hedley-Whyte ET. "Case 21-2007: A 58-year-old Woman with Headaches, Weakness, and Strokelike Episodes." New England Journal of Medicine 357, no. 2 (2007): 164.

MLA (9th ed.) Citation

DM, Greer, et al. "Case 21-2007: A 58-year-old Woman with Headaches, Weakness, and Strokelike Episodes." New England Journal of Medicine, vol. 357, no. 2, 2007, p. 164.