APA (7th ed.) Citation

F, E., TR, C., & JS, M. (1993). Sample sizes for prevention trials have been too small. American journal of epidemiology, 137(7), 787. https://doi.org/10.1093/oxfordjournals.aje.a116739

Chicago Style (17th ed.) Citation

F, Ederer, Church TR, and Mandel JS. "Sample Sizes for Prevention Trials Have Been Too Small." American Journal of Epidemiology 137, no. 7 (1993): 787. https://doi.org/10.1093/oxfordjournals.aje.a116739.

MLA (9th ed.) Citation

F, Ederer, et al. "Sample Sizes for Prevention Trials Have Been Too Small." American Journal of Epidemiology, vol. 137, no. 7, 1993, p. 787, https://doi.org/10.1093/oxfordjournals.aje.a116739.