Hongnee, J., and A. Khamsupa. “Logistics Costs in Indigo Production Using Activity-Based Costing: A Case Study Sakon Nakhon Province”. Journal of Vocational Education in Agriculture, vol. 9, no. 1, July 2025, pp. 68-76, https://li01.tci-thaijo.org/index.php/JVIA/article/view/263297.