Utama, Deddy Alif, et al. “The Risk Assessment Due to the Exposure of Co and No2 in the Traders in Malengkeri Terminal Area, Makassar City”. International Journal of Sciences: Basic and Applied Research (IJSBAR), vol. 24, no. 2, Aug. 2015, pp. 148-57, https://gssrr.org/JournalOfBasicAndApplied/article/view/4557.