APA-referens

Davies, G., & Ghabbour, E. A. (2000). Humic Substances: Versatile componenets of Plants, Soil and water. The Royal Society of Chemistry.

Chicago-stil citat

Davies, Geoffrey, och Elham A. Ghabbour. Humic Substances: Versatile Componenets of Plants, Soil and Water. U.K: The Royal Society of Chemistry, 2000.

MLA-referens

Davies, Geoffrey, och Elham A. Ghabbour. Humic Substances: Versatile Componenets of Plants, Soil and Water. The Royal Society of Chemistry, 2000.