1. Ahlfors, L. V. (1966).Complex Analysis, P. 228–230, Ed. McGraw-Hill Publishing Company, Inc, New York N.Y.
2. Garg, S. K. (2006). Irrigation Engineering and Hydraulic Structures, P. 529–540, Ed. Khanna Publishers, New Delhi.
3. Punmia, B. C. (1992).Irrigation and Water Power Engineering, P. 532–544, 953–972, Ed. Laxmi Publications PVT. LTD., New Delhi.