Fachreza Via Cahya and S. Mardiana, “PENGARUH KOMPOSISI PENJUALAN EKSPOR, COST OF GOODS SOLD RATIO DAN TOTAL ASSET TURNOVER TERHADAP RETURN ON ASSET PADA PT BUKIT ASAM TBK PERIODE 2015-2024”, ecotechnopreneur, vol. 4, no. 04, pp. 365–380, Dec. 2025.