Shahzad, Muhammad, and Ali Azam. “Tourism, Economic Growth, Environment, Human Capital and Political Instability: Heterogeneous Linkages”. iRASD Journal of Economics 5, no. 2 (June 30, 2023): 546–565. Accessed May 20, 2024. https://journals.internationalrasd.org/index.php/joe/article/view/1600.