Omita, Fitri, and Jean Elikal Marna. “The Impact of Foreign Direct Investment (FDI) and Domestic Direct Investment (DDI) on Gross Regional Domestic Product (GRDP) in Sumatra Island”. Jurnal Inovasi Pendidikan Ekonomi 16, no. 1 (July 21, 2026): 70–79. Accessed July 22, 2026. https://jipe.ppj.unp.ac.id/index.php/jipe/article/view/53.