Nofrianti, Dewi Anggun. “The No2 Gas Welding Exposure With Saturation Oxygen Levels in Commerce”. JURNAL KESEHATAN LINGKUNGAN 9, no. 1 (July 27, 2018): 92–99. Accessed January 5, 2025. https://e-journal.unair.ac.id/JKL/article/view/9178.