Ninpala, Pranattorn, and Sarist Gulthawatvichai. 2020. “FACTORS AFFECTING CONSUMERS’ INTENTION TO EMPLOY PERSONAL TRAINER SERVICES OF FITNESS CENTER IN BANGKOK METROPOLIS”. Journal of Sports Science and Health 21 (1). Bangkok, Thailand:97-110. https://he02.tci-thaijo.org/index.php/spsc_journal/article/view/241518.