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International Institute for Population Sciences and Macro International (September 2007). "National Family Health Survey (NFHS-3), 2005 –06"(PDF). Ministry of Health and Family Welfare, Government of India. pp. 436–440. คลังข้อมูลเก่าเก็บจากแหล่งเดิม(PDF)เมื่อ 2012-12-08. สืบค้นเมื่อ 5 October 2012.