J, E., S, P., D, T., M, S., I, D., & C, K. (2013). Pituitary, ovarian and additional contraceptive effects of an estradiol-based combined oral contraceptive: Results of a randomized, open-label study. Contraception, 87(2), 227. https://doi.org/10.1016/j.contraception.2012.07.008
Chicago Style (17th ed.) CitationJ, Endrikat, Parke S, Trummer D, Serrani M, Duijkers I, and Klipping C. "Pituitary, Ovarian and Additional Contraceptive Effects of an Estradiol-based Combined Oral Contraceptive: Results of a Randomized, Open-label Study." Contraception 87, no. 2 (2013): 227. https://doi.org/10.1016/j.contraception.2012.07.008.
MLA (9th ed.) CitationJ, Endrikat, et al. "Pituitary, Ovarian and Additional Contraceptive Effects of an Estradiol-based Combined Oral Contraceptive: Results of a Randomized, Open-label Study." Contraception, vol. 87, no. 2, 2013, p. 227, https://doi.org/10.1016/j.contraception.2012.07.008.