Chen, Jery, Noni Novisari Soeroso, Syamsul Bihar, and Lambok Siahaan. “Correlation Between Carbon Monoxide Level In Exhaled Air and Pulmonary Function On Grill Street-Vendors In Medan City”. Journal of Endocrinology, Tropical Medicine, and Infectious Disease (JETROMI) 3, no. 3 (August 30, 2021): 85–90. Accessed September 22, 2026. https://talenta.usu.ac.id/jetromi/article/view/6382.