1. AOAC. Official Methods of Analysis 15, Washington D.C., pp. 334, 335 and 870, 1990
2. High Institute of Public Health, Report on assessment of the prevalence of iodine deficiency disorders in the New Valley governorate, Egypt, 1993
3. The story of iodine deficiency an international challenge in nutrition;Hetzel,1989
4. The ecology of iodine;Koutras,1989
5. Hormone synthesis and thyroid iodine metabolism;Taurog,1991