السلام ابراهيم مجيد الماجد ع. (2007) “The Relationship Between Achievement Motivation and Mental Capacity in Biology for Fourth Secondary School”, College of Basic Education Research Journal, 3(3), pp. 67–98. Available at: https://stats.uomosul.edu.iq/index.php/berj/article/view/39823 (Accessed: 26 October 2025).