Nurron, Muhammad, and Dhani Ichsanuddin Nur. “nalisis rofitabilitas ada erusahaan ertambangan atubara ang erdaftar i ursa fek ndonesia”. Jurnal Riset Pendidikan Ekonomi 7, no. 1 (May 18, 2022): 28–40. ccessed July 22, 2024. http://ejournal.unikama.ac.id/index.php/jrpe/article/view/5840.