Darmawan, Romi. “Environmental Health Risk Assessment of NO2 Ambient Level and Toll Collectors Officer‘S Health Complaints”. JURNAL KESEHATAN LINGKUNGAN 10, no. 1 (August 14, 2018): 116–126. Accessed August 3, 2024. https://e-journal.unair.ac.id/JKL/article/view/9394.