APA (7th ed.) Citation

DS, B., AZ, L., KM, N., & NL, K. (1999). Are long-term hormone replacement therapy users different from short-term and never users? American journal of epidemiology, 149(3), 275. https://doi.org/10.1093/oxfordjournals.aje.a009803

Chicago Style (17th ed.) Citation

DS, Buist, LaCroix AZ, Newton KM, and Keenan NL. "Are Long-term Hormone Replacement Therapy Users Different from Short-term and Never Users?" American Journal of Epidemiology 149, no. 3 (1999): 275. https://doi.org/10.1093/oxfordjournals.aje.a009803.

MLA (9th ed.) Citation

DS, Buist, et al. "Are Long-term Hormone Replacement Therapy Users Different from Short-term and Never Users?" American Journal of Epidemiology, vol. 149, no. 3, 1999, p. 275, https://doi.org/10.1093/oxfordjournals.aje.a009803.