Susilayati, Muslimah, Putut Marwoto, and Sigit Priatmoko. “Characterization of Spent Coffee Grounds in the Community As Supporting Materials for Renewable Energy”. Jurnal Penelitian Pendidikan IPA 8, no. 2 (April 30, 2022): 918–924. Accessed November 22, 2024. https://jppipa.unram.ac.id/index.php/jppipa/article/view/1227.