1. Principles of Soil Science;Rai,2002
2. Soil Mechanics Level I, Module 3 – US Department of Agriculture Textural Soil Classification, Study Guide,1987
3. Practical Environmental Analysis;Radojevic,1999
4. Geoscience Data and Collections National Resources in Peril, Committee on the Preservation of Geoscience Data and Collections, Committee on Earth Resources, Board on Earth Sciences and Resources, Division on Earth and Life Studies, National Research Council, National Academy of Sciences, Washington DC, USA, 2002.
5. Soil and Plant Analysis;Piper,1942