Rahmah, Nadya, Cupian Cupian, and Siti Chaerani Djen Amar. 2026. “The Effect of Income, Health Level, and Education Levels on the Welfare of Palm Oil Farmers: A Case Study of Riau Province”. Indonesian Interdisciplinary Journal of Sharia Economics (IIJSE) 9 (1), 8452-58. https://doi.org/10.31538/iijse.v9i1.9007.