วิตรสุขุมาลย์ อ. ., and คุปตัษเฐียร ณ. . “Service Quality Improvement of Calibration Laboratory by Integration of SERVQUAL and Kano’s Model into QFD”. Journal of Engineering, RMUTT, vol. 1, June 2015, pp. 1-12, https://ph01.tci-thaijo.org/index.php/jermutt/article/view/242047.