Hellmann, H., Hemmings, B. D., & Pike, E. B. (1987). Analysis of surface waters. E. Horwood.
Lua i Stíl Chicago (17ú heag.)Hellmann, Hubert, B. D. Hemmings, agus E. B. Pike. Analysis of Surface Waters. Chichester: E. Horwood, 1987.
Lua MLA (9ú heag.)Hellmann, Hubert, et al. Analysis of Surface Waters. E. Horwood, 1987.
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