1. Humic Substances in Soil, Sediment and Water;Aiken,1985
2. Soil Microbiology;Alexander,1961
3. Microbiology: Fundamentals and Application;Atlas,1984
4. The discovery of microorganisms by Robert Hooke;Bardell;ASM News,1988
5. The Major Biogeochemical Cycles and Their Interaction,1983