Khethoi, S., P. W. Thasa, and P. S. Raisanguan. “The Affecting Factors of Khamkaen Nakhorn Secondary School Students’ Drop Out : A Case Study Khamkaen Nakhorn Secondary School Affiliated With Secondary School Educational Service Area Office 25, Ministry of Education”. Mahachula Academic Journal, vol. 4, no. 2, Aug. 2018, pp. 92-101, https://so04.tci-thaijo.org/index.php/JMA/article/view/141307.