1. The ovulation method: Natural family planning (5th;Billings,1987
2. The modified mucus method in India;Dorairaj;American Journal of Obstetrics and Gynecology,1991
3. Advances in Contraception, 9, 269-283,1993
4. Methods used to self-predict ovulation: A comparative study;Fehring;Journal of Obstetric, Gynecologic, and Neonatal Nursing,1990
5. New technology in natural family planning;Fehring;Journal of Obstetric, Gynecologic, and Neonatal Nursing,1991