1. Achyar, M. 2020. Pemerintah Dorong Pemulihan Lingkungan Bekas Pertambangan [Government encourages recovery of former mining environment]. https://bangda.kemendagri.go.id/berita/baca_kontent/1429/pemerintah_dorong_pemulihan_lingkungan_bekas_pertambangan (accessed July 14, 2021).
2. ENVIRONMENTAL QUALITY ON SURROUNDING COMMUNITY OF COAL MINING AREA IN SAMARINDA, EAST KALIMANTAN, INDONESIA
3. Apriando, T. 2017. Antara Ribuan Izin dan Ratusan Lubang Tambang Batubara, Kaltim Minim Pengawas [Between thousands of permits and hundreds of coal mining pits, East Kalimantan has only a few supervisors] mongabay.co.id, May 31. https://www.mongabay.co.id/2017/05/31/antara-ribuan-izin-dan-ratusan-lubang-tambang-batubara-kaltim-minim-pengawas/ (accessed November 14, 2020).
4. Ardan, M. S. 2021. Jubir Gubernur Sebut Pemprov Bisa Digugat jika Hentikan Tambang Ilegal, Jatam Tantang Debat Terbuka [A spokesperson for governor calls that the provincial government can be sued if it stops illegal mining; Jatam challenges open debate]. kaltimkece.id, November 23. https://kaltimkece.id/warta/lingkungan/jubir-gubernur-sebut-pemprov-bisa-digugat-jika-hentikan-tambang-ilegal-jatam-tantang-debat-terbuka (accessed January 14, 2022).