Abdul Malek, Siti Nazirah, Nurul Fatihah Syahronie, Nurish Alysa Sofea Roslan, and Norazreen Sharip. 2026. “Eco-Ink Production from Waste Cooking Oil”. Multidisciplinary Applied Research and Innovation 7 (1): 1-9. https://penerbit.uthm.edu.my/periodicals/index.php/mari/article/view/21623.