ebrary, Inc, Gertsen, N., & Sønderby, L. (2009). Water purification. Nova Science Publishers, Inc..
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Chicago-čujuhus (17. p.)
ebrary, Inc, Nikolaj Gertsen, juo Linus Sønderby. Water Purification. New York: Nova Science Publishers, Inc., 2009.
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MLA-čujuhus (9. p.)
ebrary, Inc, et al. Water Purification. Nova Science Publishers, Inc., 2009.
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