United Nations. Environment Programme, Global Environment Monitoring System, Meybeck, M., Chapman, D. V., Helmer, R., & World Health Organization. (1989). Global freshwater quality : a first assessment / edited by Michel Meybeck, Deborah V. Chapman, Richard Helmer: A first assessment. Published on behalf of the World Health Organization and the United Nations Environment Programme by Blackwell Reference.
Chicago Style (17th ed.) CitationUnited Nations. Environment Programme, Global Environment Monitoring System, Michel Meybeck, Deborah V. Chapman, Richard Helmer, and World Health Organization. Global Freshwater Quality : A First Assessment / Edited by Michel Meybeck, Deborah V. Chapman, Richard Helmer: A First Assessment. Oxford: Published on behalf of the World Health Organization and the United Nations Environment Programme by Blackwell Reference, 1989.
MLA (9th ed.) CitationUnited Nations. Environment Programme, et al. Global Freshwater Quality : A First Assessment / Edited by Michel Meybeck, Deborah V. Chapman, Richard Helmer: A First Assessment. Published on behalf of the World Health Organization and the United Nations Environment Programme by Blackwell Reference, 1989.