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United Nations Environment Programme ,  [Environmental Problems of the Marine and Coastal Area of Sri Lanka: National Report - UNEP Regional Seas Reports and Studies No. 74] ,  Environmental Problems of the Marine and Coastal Area of Sri Lanka: National Report - UNEP Regional Seas Reports and Studies No. 74

United Nations Environment Programme ,  [Gems-water operational guide] ,  Gems-water operational guide

United Nations Environment Programme ,  United Nations Educational Scientific and Cultural Organization ,  World Health Organization (WHO) ,  [Water quality assessments: a guide to the use of biota, sediments and water in ecosystems] ,  Water quality assessments: a guide to the use of biota, sediments and water in ecosystems