P. Thanapotivirat, W. Homboonyong, A. Amornsittinon, R. Patcharapuwadol, and N. Hamloha, “SERVICE QUALITY AND MARKETING FACTORS AFFECTING AFTER EASING OF COVID-19 PROTOCOL”, Dusit Thani College J, vol. 15, no. 2, pp. 68–79, Aug. 2021.