ชัยยะ ส. (2021). the current condition , problem and guideline for the management of the testing center and certify the performance of the person according to the standard , career and professional qualifications to develop the quality of learners and communities in Phetchabun: the current condition , problem and guideline for the management of the testing center and certify the performance of the person according to the standard , career and professional qualifications to develop the quality of learners and communities in Phetchabun. Vocational Education Innovation and Research Journal, 5(2), 99–112. retrieved from https://so06.tci-thaijo.org/index.php/ve-irj/article/view/246027