صادق أحمد حسن ه. (2007) “Definition The best tests of the muscular endurance from different positions for the males Abdomen group muscles in (15-16) ages”, College of Basic Education Research Journal, 3(1), pp. 122–144. Available at: https://stats.uomosul.edu.iq/index.php/berj/article/view/39807 (Accessed: 26 October 2025).