Ramesh, Sharvin, and PROF MADYA TS. DR. NORASIKIN BINTI MAT ISA. “THE Investigation of Proximate Analysis of Coal and Coconut Shell”. Research Progress in Mechanical and Manufacturing Engineering, vol. 2, no. 2, Jan. 2022, pp. 1017-22, https://penerbit.uthm.edu.my/periodicals/index.php/rpmme/article/view/4872.