Ahmad Shafiee, Y., and A. L. Yeon. “Trade-Related Environmental Measures under the World Trade Organization (WTO) in Malaysia: The Analysis of its’ Application”. Journal of International Studies, vol. 12, Dec. 2016, pp. 95-110, https://e-journal.uum.edu.my/index.php/jis/article/view/jis2016.12.7.