Siriboon, U., R. Rojjanaprapayon, and K. Jantarakolica. “Customer Relationship Management, Marketing Mix and Intercultural Communication in Context of Private Hospitals and Medical Tourists”. Rajapark Journal, vol. 16, no. 48, Oct. 2022, pp. 17-29, https://so05.tci-thaijo.org/index.php/RJPJ/article/view/258993.