Fauzan, Nur Syafiqah, Ezrin Hani Sukadarin, Mirta Widia, and Muhammad Faizal Zainal Abidin. 2025. “Factors Affecting Personal Hearing Protector (PHP) Use Among Industrial Workers: Development and Validation of the Questionnaire”. Jurnal Optimasi Sistem Industri 24 (2):286-304. https://doi.org/10.25077/josi.v24.n2.p286-304.2025.