TRYONO, FX YUDI. “GAS METANA BATUBARA ENERGI BARU, PERANAN PUSDIKLAT MIGAS”. Swara Patra : Majalah Ilmiah PPSDM Migas 5, no. 3 (December 31, 2015). Accessed May 19, 2024. http://ejurnal.ppsdmmigas.esdm.go.id/sp/index.php/swarapatra/article/view/155.