Muhammad, F., R. Karim, J. A. Qureshi, N. Razzaq, M. Zahra, and I. Ali. “Environmental Degradation, Quality of Institutions and Tourism: New Evidence from Pakistan: Environmental Degradation, Quality of Institutions and Tourism: New Evidence from Pakistan”. International Journal of Economic and Environmental Geology, vol. 10, no. 3, Nov. 2019, pp. 125-8, http://econ-environ-geol.org/index.php/ojs/article/view/381.