M. Balagopalan, T.P. Thomas, M.V. Mary, S. Sankar, and T.G. Alexander. “SOIL PROPERTIES IN TEAK, BOMBAX AND EUCALYPT PLANTATIONS OF TRICHUR FOREST DIVISION, KERALA”. Journal of Tropical Forest Science (JTFS), vol. 5, no. 1, Sept. 1992, pp. 35-43, https://jtfs.frim.gov.my/jtfs/article/view/1933.