“Determination of Major Cation and Anion Content in Coconut Fiber Ash Potentially Renewable Catalyst: Penentuan Kandungan Kation Dan Anion Mayor Dalam Abu Serabut Kelapa Berpotensi Katalis Renewable”. 2023. JISTECH: Journal of Information Science and Technology 6 (2). http://jistech.unipa.ac.id/index.php/istech/article/view/141.