United Nations Economic Commission for Europe (UNECE)United Nations Environment Programme (UNEP)(United Nations Economic Commission for Europe (UNECE), 1990)
Pan American Health Organization (PAHO)World Health Organization (WHO)Inter-American Association of Sanitary and Environmental Engineering (AIDIS)(Pan American Health Organization (PAHO), 2002)
Warner, KokoVan der Geest, KeesHuq, SaleemulHarmeling, SvenKusters, Koende Sherbinin, AlexKreft, Sönke(United Nations University-Institute for Environment and Human Security (UNU-EHS), 2012-11)