Kays Ghazal, Dr., Imad Aziz, Mahdi Khudhir, and Mahasin Sultan. “Estimating the Production and Cost Functions of Wheat Crop in Nineveh Governorate During the Agricultural Season 2005- 2006”. TANMIYAT AL-RAFIDAIN 32, no. 98 (March 1, 2010): 190–207. Accessed September 8, 2025. https://tanmiyat.uomosul.edu.iq/index.php/tanmiyat/article/view/30180.