Rosalina, Febrianti, and Ihsan Febriadi. “A Novel Ameliorant Biochar of Areca Nuts Skin and Sago Bark Waste for Increasing Soil Chemical Fertility”. International Journal on Advanced Science, Engineering and Information Technology 13, no. 3 (June 29, 2023): 1184–1189. Accessed May 27, 2024. https://ijaseit.insightsociety.org/index.php/ijaseit/article/view/18315.