Fahrizal. “Effect of Germination Media and Planting Depth on Viability and Vigor of Rubber Seed (Hevea Brasiliensis Muel.Arg)”. Contributions of Central Research Institute for Agriculture 16, no. 3 (July 30, 2022): 72–78. Accessed May 12, 2026. https://ejournal.cria.or.id/index.php/ccria/article/view/2.