Sittiwongsa, K., and Nopparat Rattawong. “Development Of English Learning Achievement Using Flashcards of Grade 6 Students at Ban Pa Hung School”. Journal of Lanna Societies, vol. 2, no. 3, Sept. 2024, pp. 14-20, https://so13.tci-thaijo.org/index.php/jls/article/view/795.