RAMADHAN, Fadlillah; PRATIWI, Meilanie Tri; FADZILLAH, Kylla Almira Rahma; NURHANDAYANI, Dini; ALFIANA, Alfiana. Pengaruh Gross Profit Margin (GPM) Dan Debt To Equity Ratio (DER) Terhadap Return On Assets (ROA)  Pada Perusahaan Industri Batubara Yang Terdaftar Di BEI Periode 2020-2024. Indonesia Economic Journal, [S. l.], v. 2, n. 1, p. 606–617, 2026. DOI: 10.63822/rcmbhw33. Disponível em: https://ojs.indopublishing.or.id/index.php/iej/article/view/785. Acesso em: 14 feb. 2026.