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2. Directive 2000/60/EC of the European Parliament and of the Council of 23 October 2000 Establishing a Framework for Community Action in the Field of Water Policyhttps://eur-lex.europa.eu/legal-content/EN/TXT/?uri=CELEX:32000L0060
3. Ecosystems and Human Well-Being: Synthesis,2005
4. American Academy of Environmental Engineers (AAEE). Environmental Engineering Body of Knowledge, 2009. Environmental Engineering Body of Knowledge Task Forcehttps://www.aaees.org/publications/eebodyofknowledge.php