1. Hamlyn B, Brooker S, Oleinikova K, et al. Infant Feeding 2000. Norwich, UK: The Stationary Office, 2002.
2. World Health Organization (WHO). The Optimal Duration of Exclusive Breastfeeding. Report of an Expert Consultation;Geneva, Switzerland:,2001
3. World Health Organization (WHO). Medical Eligibility Criteria for Contraceptive Use,2000
4. World Health Organization (WHO). Selected Practice Recommendations for Contraceptive Use,2002
5. Faculty of Family Planning and Reproductive Health Care (FFPRHC). UK Selected Practice Recommendations for Contraceptive Use,2002