Sitio, Arifin, and Beni Rasjid. 2018. “ANALISIS KEPUTUSAN PEMBELIAN JASA PENAMBANGAN PT BERAU COAL KEPADA PT BUKIT MAKMUR MANDIRI UTAMA (BUMA)”. JMM UNRAM - MASTER OF MANAGEMENT JOURNAL 7 (2):17-35. https://doi.org/10.29303/jmm.v7i2.379.