Sumar Hadi, Cahyo Prabowo, Irfan Putra, Raditya Irfan & Isnain Hasta. 2018. “DESIGNING OF MODIFIED FORKLIFT WITH DOUBLE HYDRAULIC BUCKET SYSTEM FOR COAL TRANSPORTING IN THE COAL MINE”. International Journal of Research Science and Management 5 (11):60-66. http://ijrsm.com/index.php/journal-ijrsm/article/view/387.