Manurung, T. B. ., and J. R. Horman. “ANALYSIS OF RETURN ON ASSET AND RETURN ON EQUITY VALUES OF COAL COMPANIES IN THE INDONESIA STOCK EXCHANGE: ANALISIS NILAI RETURN ON ASSET RETURN ON EQUITY PERUSAHAAN BATUBARA DI BURSA EFEK INDONESIA”. INTAN Jurnal Penelitian Tambang, vol. 4, no. 2, Apr. 2022, pp. 104-9, doi:10.56139/intan.v4i2.91.