1. ‘Humic Substances in Soil, Sediment, and Water’;Aiken,1985
2. ‘Humic Substances in Soil, Sediment, and Water’;Harvey,1985
3. Chemistry and potential mutagenicity of humic substances in waters from different watersheds in Britain and Ireland
4. ‘The Chemistry of Soil Constituents’;Hayes,1978
5. ‘Humic Substances and Organic Matter in Soil and Water Environments’;Häusler,1996