Syafar, M., and A. W. Wahab. “Analysis of Benzene Concentration Effects at Workplace to the Phenol Concentration in Urine of Painting Workshop Labors in Makassar, Indonesia”. International Journal of Sciences: Basic and Applied Research (IJSBAR), vol. 21, no. 2, Apr. 2015, pp. 439-45, https://gssrr.org/index.php/JournalOfBasicAndApplied/article/view/3851.