“Affect Decreasing Lung Function in Laundry Installation Worker At Rumah Sakit Umum Pusat H. Adam Malik, Medan”. Jurnal Respirologi Indonesia 38, no. 2 (April 30, 2018): 109–114. Accessed August 31, 2025. http://www.jurnalrespirologi.org/index.php/jri/article/view/165.