Tayyeb Shabbir (2018) “Revisiting the Relationship between Ability and Sheepskin Effects of Schooling on Individual Earnings: The Case of Pakistan”, Pakistan Journal of Commerce and Social Sciences, 12(2), pp. 419–442. Available at: https://jes.ac.pk/index.php/jes/article/view/261 (Accessed: 3 November 2026).