K. AlDulaimy, I. and J. AlQaysi, B. (2019) “The Influence Of Absence Of Students On The Quality Of Performance In Tests And Exams”, Opción, 350, pp. 1142-1263. Available at: http://www.produccioncientificaluz.org/index.php/opcion/article/view/31460 (Accessed: 5December2025).