1. D.C. Coleman, J.M. Oades, G. Uehara, Dynamics of Soil Organic Matter in Tropical Ecosystems, NifTAL Project, Honolulu, 1989.
2. J.M. Grainger, J.M. Lynch, Microbiological Methods for Environment Biotechnology, Academic Press, London, 1984.
3. S.E. Wedberg, Introduction to Microbiology, Reinhold Publishing Corporation, New York, 1966.
4. Response of soil microbial biomass dynamics, activity and plant litter decomposition to agricultural intensification over a seven-year period
5. D. Parkinson, E.A. Paul, Methods of Soil Analyses, American Society of Agronomy Inc., Madison, 1982.