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J Obstet Gynecol Neonatal Nurs. 1994 May;23(4):303-9. doi: 10.1111/j.1552-6909.1994.tb01881.x.
Use effectiveness of the Creighton model ovulation method of natural family planning.
Fehring RJ, Lawrence D, Philpot C
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J Obstet Gynecol Neonatal Nurs. 1994 May;23(4):303-9. doi: 10.1111/j.1552-6909.1994.tb01881.x.
Fehring RJ, Lawrence D, Philpot C