M. Haleem, Azhar, and Sahar A. Amin. “Concentrations and Health Risks Assessment of Heavy Metals in Cigarettes Within Baghdad City”. International Journal of Physical Research 9, no. 1 (April 21, 2021): 56–59. Accessed May 3, 2024. https://www.sciencepubco.com/index.php/IJPR/article/view/31470.