Arief Fathony, et al. “ Effect of Dolomite and NPK Fertilizer on Land Coal Mine Closure Of Plant Growth Rubber (Hevea Brasiliensis) in Samarinda.: Pengaruh Pemberian Dolomit Dan Pupuk NPK Pelangi Pada Lahan Pasca Tambang Batubara Terhadap Pertumbuhan Tanaman Karet (Hevea Brasiliensis) Di Samarinda”. Agrifarm: Jurnal Ilmu Pertanian, vol. 4, no. 2, Dec. 2015, pp. 60-68, https://journal.uwgm.ac.id/agrifarm/article/view/1332.