1. Allen SE, Grimshaw HM, Parkinson JA, Quarmby C (1974) Chemical analysis of ecological materials. Blackwell Scientific Publication, London
2. Anderson JM, Ingram JSP (1993) Soil biology and fertility—a handbook of methods, 2nd edn. CAB International, Wallingford
3. Bowman WD, Cairns DM, Baron JS, Seastedt TR (2002) Islands in the sky: Alpine and treeline ecosystems of the Rockies. In: Baron JS (ed) Rocky mountain futures: an ecological perspective. Island Press, Washington, pp 183–202
4. Bromley P (1995) The effect of elevation gain on soil. Environ Stud 102.
https://web.williams.edu/wp-etc/ces/soil-elevation-gain.pdf
. Retrieved 12 Sept 2017
5. Chaudhari PR, Ahire DV, Ahire VD, Chakravarty M, Maity S (2013) Soil bulk density as related to soil texture, organic matter content and available total nutrients of Coimbatore soil. Int J Sci Res Publ 3(2):1–8