1. Alexander, L.T.; Cady, J.G.Genesis and Hardening of Laterite in Soils; Tech. Bull. 1282; Soil Conservation Service, U.S. Department of Agriculture: Washington, DC, 1962; 90.
2. Buchanan, F.A Journey from Madras Through the Countries of Mysore, Canara and Malabar; East India Co.: London, 1807; 2, 440–441.
3. XV. Remarks on the Geology of the Country between Tellicberry and Madras.
4. Maignien, R.Review of Research on Laterites. Natural Resources Research IV; UNESCO: Paris, 1966; 148.