Abdullah, Suhaila, Aidatul Akmal Kamar, Nurul Aniyyah Sobri, Norazlina Hashim, and Lili Shakirah Hassan. “The Effects of Extraction Time for Coffee Waste Oil Using Non-Polar Solvent”. International Journal of Synergy in Engineering and Technology 5, no. 1 (April 15, 2024): 60-69. Accessed September 14, 2026. https://ijset.tatiuc.edu.my/index.php/ijset/article/view/217.