Purnasari, L. H., H. Siregar, and T. N. A. Maulana. “Impacts of Indonesia Raw Minerals Export Ban on Abnormal Return and Trading Volume: An Event Study on Stocks of Metals and Minerals Mining Subsector in IDX”. Asian Journal of Business and Management, vol. 3, no. 6, Dec. 2015, https://ajouronline.com/index.php/AJBM/article/view/3304.