Further information related to this fact sheet: Contraception - the Billings method.
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Related information on other website
How the Billings Ovulation Method works.
References used for this fact sheet
- World Health Organization, 1981, 'A prospective multicentre trial of the Ovulation Method of natural family planning - 11. The effectiveness phase', Fertil-Steril, vol. 36, no. 5, pp. 591-598.
- Qiang, Shao Zhen, Report of field trial involving more than 1600 cases over twelve months (1996-1997), Jiangsu Family Health Institute.
- Bhargava, H, Bhatia, JC, Ramachandran, L, Rohatgi, P & Sinha, A, 1996, 'Field Trial of Billings Ovulation Method of natural family planning - Indian Council of Medical Research', Contraception, vol. 53, pp. 69-74. More information here.
- Ryder, R, 1993, 'Natural Family Planning', British Medical Journal, vol. 307, pp. 723-725. More information here.
- Shao-Zhen Qian, De-Wei Zhang, Ren-Kang L, Lin Peng & Chang-Hai He, 'Jiangsu Family Health Institute China', Chinese Medical Journal,1998. More information here.
- World Health Organization (1977-1981) Multi-centre - Auckland, Dublin, San Miguel, Bangalore and Manila, ‘The BOM and avoiding pregnancy’, Fertility and Sterility, vol 36, pp. 152ff; pp. 591ff.
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