Sermkit, Chonlada, Witita Mayrae, Thitiya Kueklang, Paweena Sangwichain, and Chidchanok Anantamongkolkul. 2020. “TOUR OPERATOR ADJUSTMENT POST COVID-19: A PRELIMINARY STUDY”. International Conference of Business and Social Sciences 1 (1). https://ojsicobuss.stiesia.ac.id/index.php/icobuss1st/article/view/19.