บุญหนุน ส. (2019) “Free online English Dictionaries: Their Optimum use for English Learning and Teaching”, Journal of Humanities and Social Sciences, Rajapruk University, 5(supplement), pp. 1–14. Available at: https://so03.tci-thaijo.org/index.php/rpu/article/view/231785 (Accessed: 16 April 2024).