Chaemchamrus, K., N. Erb-im, Y. Phuanpoh, and R. Sermchayut. “Upgrading and Increasing Value of Souvenir Products of Tourist Attractions; Experience the Charm of the Old City Life Style, Phra Nakhon Si Ayutthaya Province”. Journal of Arts Management, vol. 6, no. 3, Sept. 2022, pp. 1585-03, https://so02.tci-thaijo.org/index.php/jam/article/view/257035.