„About UNSGAB“ (en-US). United Nations Secretary-Generals' Advisory Board on Water and Sanitation. 2012-yil 30-iyulda asl nusxadan arxivlangan. Qaraldi: 2013-yil 28-yanvar.
„About UNSGAB“ (en-US). United Nations Secretary-Generals' Advisory Board on Water and Sanitation. 2012-yil 30-iyulda asl nusxadan arxivlangan. Qaraldi: 2013-yil 28-yanvar.