Chapter 15: Scientific Foundations of the CrMS
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Two methods of natural family planning
American Journal of Obstetrics and Gynecology, 136(5), 697-698
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Billings, J. J. (1980). Two methods of natural family planning. *American Journal of Obstetrics and Gynecology*, *136*(5), 697-698. https://doi.org/10.1016/0002-9378(80)91034-0
Billings JJ. Two methods of natural family planning. Am J Obstet Gynecol. 1980;136(5):697-698. doi:10.1016/0002-9378(80)91034-0
Billings, J. J. "Two methods of natural family planning." *American Journal of Obstetrics and Gynecology*, vol. 136, no. 5, 1980, pp. 697-698.