โอภาสบุตร อ., กอมณี ส., and หกสุวรรณ พ. “The Development of Training Package on Counterfeit Gold Checking for Gold Shop Staffs”. Journal of Educational Review Faculty of Education in MCU, vol. 6, no. 2, Aug. 2019, pp. 167-7, https://so02.tci-thaijo.org/index.php/EDMCU/article/view/192708.