ทองเถา จิตระวี. 2018. “CAUSAL RELATIONSHIP MODEL AFFECTING CUSTOMER LOYALTY TO USE MOBILE PHONE SYSTEM SERVICES IN THAILAND”. Journal of Business Administration The Association of Private Higher Education Institutions of Thailand 7 (2). Bangkok, Thailand:124-37. https://so02.tci-thaijo.org/index.php/apheitvu/article/view/154410.