APA aipamena

GAFFNEY, J. S. Humic and fulvic acids / Jeffrey S.Gaffney, Nacy A. Marley. Washington.

Chicago Style aipamena

GAFFNEY, JEFFREY S. Humic and Fulvic Acids / Jeffrey S.Gaffney, Nacy A. Marley. Washington.

MLA aipamena

GAFFNEY, JEFFREY S. Humic and Fulvic Acids / Jeffrey S.Gaffney, Nacy A. Marley. Washington.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.