TRYONO, F. Y. GAS METANA BATUBARA ENERGI BARU, PERANAN PUSDIKLAT MIGAS. Swara Patra : Majalah Ilmiah PPSDM Migas, [S. l.], v. 5, n. 3, 2015. Disponível em: http://ejurnal.ppsdmmigas.esdm.go.id/sp/index.php/swarapatra/article/view/155. Acesso em: 19 may. 2024.