ปิยะศิริศิลป์ ธ. “Relationship Between Service Marketing Mix Factors and Behaviors of Yoga studio’s Customers in Bangkok”. Journal of Rattana Bundit University, vol. 16, no. 1, Sept. 2021, pp. 80-93, https://so03.tci-thaijo.org/index.php/rbac/article/view/246560.