สัตนาโค พ. “The Development of the Ability of English vocabulary learning of Pratomsuksa 2 students by using Role - Play method and English Vocabulary Writing Exercises”. Academic Journal of Mahamakut Buddhist University Roi Et Campus, vol. 8, no. 1, Nov. 2018, pp. 148-55, https://so01.tci-thaijo.org/index.php/AJMBU/article/view/194941.