Intasuwan, S., and O. Sakarin. “Buying Decision Behavior of Tourists’ Souvenirs in old Town, Songkhla”. Research and Development Institute Journal of Chaiyaphum Rajabhat University, vol. 1, no. 2, Dec. 2022, pp. 79-86, https://so10.tci-thaijo.org/index.php/rdicpru/article/view/172.