Dinger, J. C., M. Cronin, S. Mohner, I. Schellschmidt, T. D. Minh, and C. Westhoff. «Oral Contraceptive Effectiveness According to Body Mass Index, Weight, Age, and Other Factors». American Journal of Obstetrics & Gynecol ogy 201, no. 3 (2009): 263 e1 – 269.
Holt, V. L., K. L. Cushing-Haugen, and J. R. Daling. «Body Weight and Risk of Oral Contraceptive Failure». Obstetrics & Gynecol ogy 99, no. 5 Pt 1 (2002): 820–827.
Westhoff, C. L., A. H. Torgal, E. R. Mayeda, F. Z. Stanczyk, J. P. Lerner, E. K. Benn, and M. Paik. «Ovarian Suppression in Normal-Weight and Obese Women During Oral Contraceptive Use: A Randomized Controlled Trial». Obstetrics & Gynecol ogy 116, no. 2 Pt 1 (2010): 275–283.