17 Laely Mychew District (2013) Population census. Laelay Maychew: District Office.
19World Health Organization (WHO)/United Nations Children's Fund/International Council for Control of Iodine Disorders (2011) Assessment of Iodine Deficiency Disorders and Monitoring their Elimination. A Guide of Programme Managers. WHO/NHD/01.1. Geneva: WHO, 1–107.