A. Jabbar, Abduljabbar Hani, y Yousra Mahdi Hasan. «The Supply Card System: Analytical Study of Some Economic and Social Dimensions». Opción 350 (agosto 13, 2019): 221-238. Accedido agosto 3, 2025. http://www.produccioncientifica.luz.edu.ve/index.php/opcion/article/view/24695.