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WikiPedia: Utiliti awam http://www.refabrica.com/ //doi.org/10.1080%2F00220485.1991.10844706 //www.jstor.org/stable/1182423 http://water.worldbank.org/water/publications/wate... http://www.businessadvisoryservice.co.uk/?news https://www.encyclopedia.com/social-sciences-and-l... https://www.newspapers.com/clip/2003162/mother_bro... https://catalog.archives.gov/id/10641240 https://d-nb.info/gnd/4133382-2 https://id.ndl.go.jp/auth/ndlna/00566127