Davies, G., & Ghabbour, E. A. (2000). Humic Substances: Versatile componenets of Plants, Soil and water. The Royal Society of Chemistry.
Čikaški stil citiranjaDavies, Geoffrey, i Elham A. Ghabbour. Humic Substances: Versatile Componenets of Plants, Soil and Water. U.K: The Royal Society of Chemistry, 2000.
MLA način citiranjaDavies, Geoffrey, i Elham A. Ghabbour. Humic Substances: Versatile Componenets of Plants, Soil and Water. The Royal Society of Chemistry, 2000.
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