Putri, Diah Ayu Kusuma, et al. “Analysis of the Results of the Reduction of Cyanide Acid Content in Hevea Brasiliensis Seeds”. Journal of Natural Sciences and Mathematics Research, vol. 5, no. 1, June 2019, pp. 20-23, https://journal.walisongo.ac.id/index.php/JNSMR/article/view/11026.