Phoocharoensil, S., B. Moore, C. Gampper, E. Geerson, P. Chaturongakul, S. Sutharoj, and W. Carlon. “Grammatical and Lexical Errors in Low-Proficiency Thai Graduate Students’ Writing”. LEARN Journal: Language Education and Acquisition Research Network, vol. 9, no. 1, June 2016, pp. 11-24, https://so04.tci-thaijo.org/index.php/LEARN/article/view/102659.