T. W. Hoe, L. C. Ying, and W. Yanzhen, “Mandarin Communication Learning app: A proof-of-concept prototype of contextual learning”, JRPPTTE, vol. 3, no. 2, pp. 38–48, Sep. 2018, Accessed: Dec. 05, 2025. [Online]. Available: https://ejournal.upsi.edu.my/index.php/JRPPTTE/article/view/172