DINGES, R. (1982). Natural Systems For Water Pollution Control Ray Dinges. Van Nostrand Reinhold Co.
Lua i Stíl Chicago (17ú heag.)DINGES, Ray. Natural Systems For Water Pollution Control Ray Dinges. Van Nostrand Reinhold Co, 1982.
Lua MLA (8ú heag.)DINGES, Ray. Natural Systems For Water Pollution Control Ray Dinges. Van Nostrand Reinhold Co, 1982.
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