Sim, Shin Ying, and Muhammad Fakri Othman. “Pocket Music Theory: The Development of Augmented Reality (AR) Basic Music Theory Learning Mobile Application”. Applied Information Technology And Computer Science, vol. 3, no. 2, Nov. 2022, pp. 647-66, https://penerbit.uthm.edu.my/periodicals/index.php/aitcs/article/view/7483.