โสธรวัฒนา ว., ศรีวาณัติ อ., & ปฐมศิริกุล เ. (2019). A Model of Service Marketing Strategy, Perceived Service Quality Affecting Customer Loyalty of Tutorial School in Thailand. Creative Business and Sustainability Journal, 41(2), 22–56. Retrieved from https://so01.tci-thaijo.org/index.php/CBSReview/article/view/198078