“Studi Tentang Penyebaran Pohon Ulin (Eusideroxylon Zwageri Teijsm. & Binn.) Di Taman Nasional Kutai Kalimantan Timur”. Jurnal Pertanian Terpadu, vol. 3, no. 1, Juni 2015, hlm. 144-53, https://doi.org/10.36084/jpt. v3i1.95.