Omita F, Marna JE. The Impact of Foreign Direct Investment (FDI) and Domestic Direct Investment (DDI) on Gross Regional Domestic Product (GRDP) in Sumatra Island. JIPE [Internet]. 2026 Jul. 21 [cited 2026 Jul. 22];16(1):70-9. Available from: https://jipe.ppj.unp.ac.id/index.php/jipe/article/view/53