Cheewananthadit, S., and P. Thanalerdsopit. “Service Marketing Mix Influencing a Decision on Buying a Used Car of Customers in Chiang Mai Province”. RMUTL Journal of Business Administration and Liberal Arts, vol. 9, no. 1, June 2021, pp. 19-34, https://so05.tci-thaijo.org/index.php/balajhss/article/view/248394.