Senachakr, K., N. Boonyanam, and N. Maithongdee. “Factor Affecting the Tour Companies’ Decision to Book Flight for U-Tapao – Incheon Route, South Korea at U–Tapao Airport”. Journal of Thai Hospitality and Tourism, vol. 17, no. 1, Feb. 2022, pp. 3-18, https://so04.tci-thaijo.org/index.php/tourismtaat/article/view/247140.