Hellawell, J. M. (1989). Biological indicators of freshwater pollution and environmental management (1st ed. Reprint.). Elsevier Applied Science.
Citácia podle Chicago (17th ed.)Hellawell, J. M. Biological Indicators of Freshwater Pollution and Environmental Management. 1st ed. Reprint. London: Elsevier Applied Science, 1989.
Citácia podľa MLA (8th ed.)Hellawell, J. M. Biological Indicators of Freshwater Pollution and Environmental Management. 1st ed. Reprint. Elsevier Applied Science, 1989.
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