HARTUTI PURNAWENI, KISMARTINI, BULAN PRABAWANI, and ALI ROZIQIN. “Politics and Business: The Policy on Tin Mining in Bangka”. International Journal of Business and Economic Affairs, Vol. 4, no. 3, June 2019, pp. 133-9, https://ijbea.com/ojs/index.php/ijbea/article/view/111.