Aridah, Ahmad M. β€œAN ECONOMIC STUDY OF ESTIMATING COST FUNCTION DATES PRODUCTION IN WADI AL-AJAL , SOUTHWESTERN LIBYA ”. Diyala Agricultural Sciences Journal 6, no. 1 (June 30, 2014): 65–75. Accessed May 2, 2024. https://journal.djas.uodiyala.edu.iq/index.php/dasj/article/view/1660.