Sagab, Anwar MUhsan. “Economic Analysis of the Costs of Wheat Production Functions Wasit Province”. Al Kut Journal of Economic and Administrative Sciences 2, no. 2 (April 1, 2010): 192-204. Accessed November 24, 2019. https://kjeas.uowasit.edu.iq/index.php/kjeas/article/view/54.