Leksuksri, J., K. Hongsri, and T. . Ardsamang. “The Feasibility Study on Using Indigo Residues from the Natural Dye Extraction Process to Produce Handicraft Paper”. Bulletin of Applied Sciences, vol. 12, no. 1, Apr. 2023, pp. 57-63, doi:10.60136/bas.v12.2023.392.