Shee, Chen Yu, and Ezak Fadzrin Bin Ahmad Shaubari. “Happy Español: Development of 2D Mobile Learning Application for Spanish Language”. Applied Information Technology And Computer Science, vol. 6, no. 1, July 2025, pp. 1431-48, https://penerbit.uthm.edu.my/periodicals/index.php/aitcs/article/view/16525.