Shavana, Shavana Aditya Yolanda, Syaparuddin Syaparuddin, Syamsurijal Tan Syamsurijal Tan, and Syaparuddin Syaparuddin. “A Study Of Income Inequality in Sumatera Island”. The Asian Journal of Professional & Business Studies 5, no. 1 (June 29, 2024). Accessed September 19, 2024. https://journal.uptm.edu.my/index.php/ajpbs/article/view/318.