Sari, Dwita Kartika, and Hamdi Akhsan. “Development of Project-Based Student Worksheets on Renewable Energy by Utilising Rubber Fruit Shell Waste to Increase Motivation”. Sriwijaya University Learning and Education International Journal 1, no. 3 (May 12, 2025): 139–152. Accessed June 7, 2025. https://sule-ij.ejournal.unsri.ac.id/index.php/sule-ij/article/view/15.