Endri E, Utama AP, Aminudin A, Effendi MS, Santoso B, Bahiramsyah A. Coal Price and Profitability: Evidence of Coal Mining Companies in Indonesia. IJEEP [Internet]. 2021 Aug. 20 [cited 2024 Nov. 15];11(5):363-8. Available from: https://econjournals.com./index.php/ijeep/article/view/11503