Bala, M. ., M. N. . Shamsudin, A. . Radam, and I. . Abd Latif. “Profit Efficiency Among Cotton Farmers: A Cobb-Douglass Stochastic Frontier Production Function Analysis”. Journal of Asian Scientific Research, vol. 8, no. 7, Sept. 2018, pp. 237-46, doi:10.18488/journal.2.2018.87.237.246.