Cita APA (7a ed.)

Ebrahim, S. H., & Gfroerer, J. (2003). Pregnancy-related substance use in the United States during 1996-1998. Obstetrics & gynecology, 101(2), 374-379. doi:10.1016/S0029-7844(02)02588-7

Cita Chicago Style (17a ed.)

Ebrahim, Shahul H., y Joseph Gfroerer. "Pregnancy-related Substance Use in the United States During 1996-1998." Obstetrics & Gynecology 101, no. 2 (2003): 374-379. https://doi.org/10.1016/S0029-7844(02)02588-7.

Cita MLA (9a ed.)

Ebrahim, Shahul H., y Joseph Gfroerer. "Pregnancy-related Substance Use in the United States During 1996-1998." Obstetrics & Gynecology, vol. 101, no. 2, 2003, pp. 374-379, https://doi.org/10.1016/S0029-7844(02)02588-7.