Koroh, L. I. D., A. M. Mbete, I. W. Simpen, and I. B. P. Yadnya. “Perception of Sabu Raijua Speech Community about Due (palm Tree)”. International Journal of Linguistics, Literature and Culture, vol. 3, no. 4, July 2017, pp. 7-16, https://sloap.org/journals/index.php/ijllc/article/view/213.