Fakchareonphol, Witat, Kulthida Nugultham, Tussatrin Wannagatesiri, and Nantarat Kruea-in. 2018. “School Performance Indicator on Improving Student Learning Achievement through O-NET Scores: Factor Analysis on Student Prior Achievement and Size of the School”. Kasetsart Journal of Social Sciences 39 (2):780-88. https://so04.tci-thaijo.org/index.php/kjss/article/view/242546.