Azhar, Faiz Hafeez, et al. “Simple Approach in Measuring the Synthesized Zeolite from Kaolin As Nutrient Retention for Mung Bean Growth”. Emerging Advances in Integrated Technology, vol. 3, no. 2, Jan. 2023, pp. 52-59, https://penerbit.uthm.edu.my/ojs/index.php/emait/article/view/12650.