พริบไหว ศ., and คุปตัษเฐียร ณ. . “Service Quality in Engineering Graduate Programs Using SERVQUAL-TRAN”. Journal of Engineering, RMUTT, vol. 1, June 2015, pp. 25-34, https://ph01.tci-thaijo.org/index.php/jermutt/article/view/242053.