พลอยเพ็ชร อัญชลี. 2018. “Efficiency and Effectiveness of Quality Assurance, Nakhon Phanom University in Academic Year 2015”. Journal of Humanities and Social Sciences, Rajapruk University 3 (1):71-82. https://so03.tci-thaijo.org/index.php/rpu/article/view/112548.