Khan, Aamir, and Himayatullah Khan. “Return to Schooling for Public and Private Sector Higher Education Institutions of Khyber Pakhtunkhwa-Pakistan”. International Journal of Economics and Financial Issues, vol. 10, no. 4, July 2020, pp. 125-31, https://econjournals.com.tr/index.php/ijefi/article/view/10004.