Natural family planning
Frequently, when one mentions natural family planning methods, the response is doubt, bewilderment, ridicule, or scorn. Much of this is due to the fact that many people know only of the rhythm method,...
Lancet (London, England), 2(7788), 1193-1194
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Billings JJ (1972). Ovulation method of family planning. *Lancet (London, England)*, *2*(7788), 1193-1194. https://doi.org/10.1016/s0140-6736(72)92610-4
Billings JJ. Ovulation method of family planning. Lancet. 1972. doi:10.1016/s0140-6736(72)92610-4
Billings, J. J. "Ovulation method of family planning." *Lancet (London, England)*, 1972.