Hasan, Umar, Wahyu Zulianto, and Osly Usman. “The Influence of Sustainable Raw Material Availability and Environmentally Friendly Image on Competitive Advantage: The Mediating Role of Product Innovation”. Golden Ratio of Data in Summary 5, no. 4 (September 4, 2025): 784–796. Accessed April 30, 2026. https://goldenratio.id/index.php/grdis/article/view/1386.