วงศ์ประกรณ์กุล ศ. (2018) “Policy Recommendations Making with Net Promoter Score”, Journal of Humanities and Social Sciences, Rajapruk University, 3(2), pp. 56–68. Available at: https://so03.tci-thaijo.org/index.php/rpu/article/view/112600 (Accessed: 7 May 2024).