1. Definition and prevalence of subfertility and infertility
2. Social determinants of human reproduction
3. Speroff L, Glass R H, Kase N G. Clinical gynecologic endocrinology and infertility, 6th edn. Lippincott Williams & Wilkins, Baltimore 1999; 1013–1037
4. World Health Organization. Current practices and controversies in assisted reproduction. Report of a meeting on medical, ethical and social aspects of assisted reproduction. World Health Organization Library Cataloguing-in-Publication Data, Geneva 2002; 15–396