The maternal cortisol awakening response in human pregnancy is associated with the length of gestation.

MLA

Buss, Claudia, et al. “The Maternal Cortisol Awakening Response in Human Pregnancy Is Associated with the Length of Gestation.” American Journal of Obstetrics & Gynecology, vol. 201, no. 4, Oct. 2009, p. 398.e1-398.e8. EBSCOhost, https://doi.org/10.1016/j.ajog.2009.06.063.

APA

Buss, C., Entringer, S., Reyes, J. F., Chicz-DeMet, A., Sandman, C. A., Waffarn, F., & Wadhwa, P. D. (2009). The maternal cortisol awakening response in human pregnancy is associated with the length of gestation. American Journal of Obstetrics & Gynecology, 201(4), 398.e1-398.e8. https://doi.org/10.1016/j.ajog.2009.06.063

Chicago

Buss, Claudia, Sonja Entringer, Jonazary F. Reyes, Aleksandra Chicz-DeMet, Curt A. Sandman, Feizal Waffarn, and Pathik D. Wadhwa. 2009. “The Maternal Cortisol Awakening Response in Human Pregnancy Is Associated with the Length of Gestation.” American Journal of Obstetrics & Gynecology 201 (4): 398.e1-398.e8. doi:10.1016/j.ajog.2009.06.063.