APA (7th ed.) Citation

A, O., J, H., L, B., E, E., M, H., M, L., . . . Kalin, M. (1998). Randomised trial of 23-valent pneumococcal capsular polysaccharide vaccine in prevention of pneumonia in middle-aged and elderly people. Swedish Pneumococcal Vaccination Study Group. Lancet, 351(9100), 399. https://doi.org/10.1016/s0140-6736(97)07358-3

Chicago Style (17th ed.) Citation

A, Ortqvist, et al. "Randomised Trial of 23-valent Pneumococcal Capsular Polysaccharide Vaccine in Prevention of Pneumonia in Middle-aged and Elderly People. Swedish Pneumococcal Vaccination Study Group." Lancet 351, no. 9100 (1998): 399. https://doi.org/10.1016/s0140-6736(97)07358-3.

MLA (9th ed.) Citation

A, Ortqvist, et al. "Randomised Trial of 23-valent Pneumococcal Capsular Polysaccharide Vaccine in Prevention of Pneumonia in Middle-aged and Elderly People. Swedish Pneumococcal Vaccination Study Group." Lancet, vol. 351, no. 9100, 1998, p. 399, https://doi.org/10.1016/s0140-6736(97)07358-3.