Anjna D. Tevani, N. M. Joshipura, M. J. Gundalia, and Jignesh A. Shah. “Comparison of Different Methods for Estimating Reference Evapotranspiration in Semi-Arid Region”. International Journal of Advance Research in Engineering, Science & Technology, vol. 4, no. 4, Apr. 2017, pp. 748-50, https://ijarest.org/index.php/ijarest/article/view/1305.