Jaruwong, P., J. Aumpush, and R. (Wibulswas) Kiattikomol. “Uptake of Cationic and Azo Dyes by Montmorillonite in Batch and Column Systems”. Science & Technology Asia, Vol. 10, no. 1, 1, pp. 47-56, https://www.tci-thaijo.org/index.php/SciTechAsia/article/view/41596.