Kongmaneechachwan, T., and T. Suwannoi. “Model Building for Consumer Choice to Pay for Goods and Services via QR Code by Smartphone: A Case Study of Bangkok and Surrounding”. Ph.D. In Social Sciences Journal, vol. 12, no. 1, Apr. 2022, pp. 41-56, https://so05.tci-thaijo.org/index.php/phdssj/article/view/229719.