Purinthrapibal, S., and K. Laopiyabutra. “The Usage of French Learning Strategies of Secondary School Students in the South”. Journal of International Studies, Prince of Songkla University, vol. 7, no. 2, Feb. 2018, pp. 97-123, https://so03.tci-thaijo.org/index.php/jis/article/view/113211.