“Kondisi Tanah Habitat Ulin (Eusideroxylon zwageri T & B) di Prevab Taman Nasional Kutai Kabupaten Kutai Timur”. Jurnal Pertanian Terpadu 6, no. 1 (Juni 13, 2018): 11–20. Diakses September 3, 2026. https://ojs.mine-cloud.my.id/jpt/article/view/138.