Elsa Efrina, Achmad Hufad, Endang Rochyadi, Asep Bayu Dani Nandiyanto, Rila Muspita , Abu Yazid Abu Bakar. “Teaching Principle of Sound Intensity Using Closed-Pipe Organs That Contain Various Levels of Water for Students With Deaf and Hard Hearing”. International Journal of Advanced Science and Technology 29, no. 7 (June 1, 2020): 5023-5030. Accessed May 4, 2024. http://sersc.org/journals/index.php/IJAST/article/view/23560.