Yetri, Yuli. “Potential Activated Carbon of Theobroma Cacao L. Shell for Pool Water Purification in Politeknik Negeri Padang”. Jurnal Riset Teknologi Pencegahan Pencemaran Industri 12, no. 1 (May 27, 2021): 32–38. Accessed June 2, 2025. https://jrtppi.id/index.php/jrtppi/article/view/98.