เขียนชานาจ เ., and คงกลํ่า อ. “Factors Affecting English Language Learning Achievement of Lower Secondary School Students Under the Offi F Ice of Secondary Educational Service Area 8”. Mahamakut Graduate School Journal, vol. 17, no. 1, Aug. 2019, pp. 222-36, https://so04.tci-thaijo.org/index.php/mgsj/article/view/212471.