Kosasaeng, Prem, and Jeerasak Pokawin. “Indigo Dyeing Product Development and Marketing Promotion of Indigo Dyeing Products of Natural Dyeing Weaving Group at Ban Phanna, Phanna Sub-District, Sawang Daen Din District, Sakon Nakhon Province”. Princess of Naradhiwas University Journal of Humanities and Social Sciences 9, no. 1 (January 27, 2022): 91–113. Accessed April 29, 2024. https://so05.tci-thaijo.org/index.php/pnuhuso/article/view/251573.