Unesco, Ryding, S., & Rast, W. (1989). The Control of euthrophication of lakes and reservoirs. Published by Unesco and Parthenon.
Chicago-viite (17. p.)Unesco, Sven-Olof Ryding, ja Walter Rast. The Control of Euthrophication of Lakes and Reservoirs. Paris and UK: Published by Unesco and Parthenon, 1989.
MLA-viite (9. p.)Unesco, et al. The Control of Euthrophication of Lakes and Reservoirs. Published by Unesco and Parthenon, 1989.
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