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 6, no. 1 (July 8, 2025): 1431–1448. Accessed April 7, 2026. https://publisher.uthm.edu.my/periodicals/index.php/aitcs/article/view/16525.