Alhasan, H. M., Ghambeel, K. koko و Al-Khalifa, O. H. (2012) "The relationship between achievement motivation, locus of control, aspiration, and achievement among the students of higher education institutions in Sudan", المجلة الدولية لتطوير التفوق, 3(1). doi: 10.20428/ijtd.v3i1.654.