1. Alexander M (1978) Introduction to soil microbiology, 2nd edn. Wiley Eastern Limited, New Delhi, p 465
2. Arunachalam A, Arunachalam K (2000) Influence of gap size and soil properties on microbial biomass in a subtropical humid forest of north-east India. Plant Soil 223:185–193
3. Atlas RM, Bertha R (1998) Mirobial ecology; fundamentals and applications, 4th edn. Pearson Education (Indian Branch), New Delhi, p 704
4. Breure AM (2004) Soil biodiversity: measurements, indicators, threats and soil functions. international conference, soil and compost biology, Leon-Spain Session 1, Paper 3, p 96
5. Chatterjee SN, Bhattacharya T, Dangar TK, Chandra G (2007) Ecology and diversity of Bacillus thuringiensis in soil environment. Afr J Biotechonol 6(13):1587–1591