Liew, Yih Hui. “Export of Malaysia Rubber to the United States, 1970-1990”. Perspektif Jurnal Sains Sosial dan Kemanusiaan 14, no. 2 (September 14, 2022): 11–24. Accessed May 3, 2024. https://ojs.upsi.edu.my/index.php/PERS/article/view/7406.