Darma, Surya. “Land Suitability of Rice Fields in Bumi Rapak Village and Selangkau Village East Kutai Regency: Kesesuaian Lahan Padi Sawah Di Desa Bumi Rapak Dan Desa Selangkau Kabupaten Kutai Timur”. Jurnal Ilmu Tanah dan Lingkungan 24, no. 1 (June 15, 2022): 32-38. Accessed December 9, 2022. https://jma.journal.ipb.ac.id/index.php/jtanah/article/view/37521.