Puspaningsih, Nining, Kukuh Murtilaksono, Naik Sinukaban, JayaI Nengah Surati, and Yadi Setiadi. 2010. “Reforestation Achievement Monitoring at Mining Area through Soil Index Model”. Jurnal Manajemen Hutan Tropika 16 (2). Bogor, INA, 53-62. https://journal.ipb.ac.id/index.php/jmht/article/view/1937.