Doah Dekok Tarigans. “SOIL PROPERTIES AND NUTRIENT ELEMENT STATUS OF COCONUT LEAVES UNDER DEFFERENT CROPPING PATTERNS”. CORD 4, no. 01 (December 1, 1988): 34. Accessed May 2, 2024. https://journal.coconutcommunity.org/index.php/journalicc/article/view/212.