Mohammed , Adel Abdulla, et al. “Academic Procrastination Among College Students With Learning Disabilities: The Role of Positive and Negative Self-Oriented Perfectionism in Terms of Gender, Specialty and Grade”. Psycho-Educational Research Reviews, vol. 2, no. 1, Apr. 2013, pp. 2-12, https://perrjournal.com/index.php/perrjournal/article/view/382.