Suprapto, Nadi, et al. “Development of Wireless Kundt’s Tube Kit As an Experiment Tool in Determining Speed of Sound and Proposing for a Hearing Test”. International Journal of Online and Biomedical Engineering (iJOE), vol. 18, no. 02, Feb. 2022, pp. pp. 200-210, doi:10.3991/ijoe.v18i02.23267.