S. F. Zainal Bakri, A. Hariri, M. Ismail, and A. A. Muhamad Damanhuri, “Evaluation of Industrial Workplace Exposure to Metal Fumes using Toenail as Bio-Indicator”, IJIE, vol. 11, no. 5, pp. 133–139, Sep. 2019, Accessed: Apr. 07, 2026. [Online]. Available: https://penerbit.uthm.edu.my/ojs/index.php/ijie/article/view/4607