United Nations Environment Programme, Water Supply and Sanitation Collaborative Council, World Health Organization, ebrary, Inc, Helmer, R., & Hespanhol, I. (1997). Water pollution control: A guide to the use of water quality management principles. E & FN Spon.
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Chicago Style (17th ed.) Zitazioa
United Nations Environment Programme, Water Supply and Sanitation Collaborative Council, World Health Organization, Inc ebrary, Richard Helmer, eta Ivanildo Hespanhol. Water Pollution Control: A Guide to the Use of Water Quality Management Principles. London ; New York: E & FN Spon, 1997.
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MLA (9th ed.) Zitazioa
United Nations Environment Programme, et al. Water Pollution Control: A Guide to the Use of Water Quality Management Principles. E & FN Spon, 1997.
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