Yuangsawad, R., ๋Jarenwongjongdee J., and B. Apiruksap. “Application of Chitosan Beads as the Bio-Adsorbent for Hexavalent Chromium Removal from Aqueous Solutions”. Frontiers in Engineering Innovation Research, vol. 20, no. 2, Dec. 2022, pp. 25-35, https://ph01.tci-thaijo.org/index.php/jermutt/article/view/250545.