Manullang, Frenky Sorimuda, Adlin Adnan, and Delfitri Munir. “Factors Affecting Presbycusis on Audiogram Overview at H. Adam Malik General Hospital Medan”. Journal of Epidemiology and Public Health 6, no. 1 (July 11, 2021): 12–20. Accessed May 11, 2024. https://www.jepublichealth.com/index.php/jepublichealth/article/view/362.