Porodong, Paul. “Indigenous Knowledge on Soil Potential and Swidden Sustainability: A Preliminary Observation from Sabah, Malaysia”. Journal of Borneo-Kalimantan 7, no. 2 (December 30, 2021): 73–84. Accessed November 24, 2024. https://publisher.unimas.my/ojs/index.php/BJK/article/view/4403.