Pongpituk, P. “Factors Influencing the Effectiveness in Ordinary National Education Test of Grade 9 Student in Kanchanaburi Province”. Dhammathas Academic Journal, vol. 18, no. 2, Aug. 2018, pp. 1-10, https://so06.tci-thaijo.org/index.php/dhammathas/article/view/109137.