MAYASARI, W.; SUHARTOYO, H.; MUKTAMAR, Z. PERSEPSI PEKERJA TAMBANG BATUBARA PT. FIRMAN KETAUN. Naturalis: Jurnal Penelitian Pengelolaan Sumberdaya Alam dan Lingkungan, [S. l.], v. 8, n. 1, p. 9–14, 2019. DOI: 10.31186/naturalis.8.1.9157. Disponível em: https://ejournal.unib.ac.id/naturalis/article/view/9157. Acesso em: 7 sep. 2025.