Penerapan prinsip pembangunan berkelanjutan pada daerah penghasil panas bumi: wilayah kerja panas bumi: Gunung Leuser, Gunung Sorik Marapi, Gunung Ciremai, dan Gunung Lawu = Application of sustainable development principle on the geothermal producing region: geothermal work area: Mount Leuser, Mount Sorik Marapi, Mount Ciremai, and Mount Lawu