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9. A second look at natural family planning. Lolarga E. Initiatives Popul; 1983 Oct 01; 7(1):2-12. PubMed ID: 12265791 [Abstract] [Full Text] [Related]
10. [The risks of the natural family planning methods]. Zufferey MM. Ther Umsch; 1986 May 01; 43(5):417-24. PubMed ID: 3726778 [Abstract] [Full Text] [Related]
11. Breastfeeding and the return of fertility. Kippley JF. CCL News; 1978 May 01; 4(4):5. PubMed ID: 12335447 [Abstract] [Full Text] [Related]
12. Natural family planning. Davis MS. NAACOGS Clin Issu Perinat Womens Health Nurs; 1992 May 01; 3(2):280-90. PubMed ID: 1596436 [Abstract] [Full Text] [Related]
13. Natural family planning. I. The peak symptom and estimated time of ovulation. Hilgers TW, Abraham GE, Cavanagh D. Obstet Gynecol; 1978 Nov 01; 52(5):575-82. PubMed ID: 724176 [Abstract] [Full Text] [Related]
14. Natural family planning in 1985: a status report. Spieler J, Shuler A. Popul Today; 1985 May 01; 13(5):3, 9. PubMed ID: 12280130 [Abstract] [Full Text] [Related]