Wathanakom, Narubodee. 2022. “The Causal Relationship Between Alternative COVID-19 Vaccine Marketing Mix and Service Quality of Private Hospitals With the Decision to Reserve Vaccine Among Working Adults Living Bangkok”. Rajapark Journal 16 (46). Bangkok, Thailand:374-88. https://so05.tci-thaijo.org/index.php/RJPJ/article/view/258493.