พริบไหว ศ. and คุปตัษเฐียร ณ. (2015) “Service Quality in Engineering Graduate Programs Using SERVQUAL-TRAN”, Frontiers in Engineering Innovation Research, 1, pp. 25–34. available at: https://ph01.tci-thaijo.org/index.php/jermutt/article/view/242053 (accessed: 2 September 2026).