GAFFNEY, J. S. Humic and fulvic acids / Jeffrey S.Gaffney, Nacy A. Marley. Washington.
Lua i Stíl Chicago (17ú heag.)GAFFNEY, JEFFREY S. Humic and Fulvic Acids / Jeffrey S.Gaffney, Nacy A. Marley. Washington.
Lua MLA (8ú heag.)GAFFNEY, JEFFREY S. Humic and Fulvic Acids / Jeffrey S.Gaffney, Nacy A. Marley. Washington.
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