طه محمود م. (2011) “A comparative study of bacterial Pathogenesis isolated from naso oral cavity for smokers and non smokers in different ages”, College of Basic Education Research Journal, 10(1), pp. 443–455. Available at: https://jeh.uomosul.edu.iq/index.php/berj/article/view/38608 (Accessed: 27 October 2025).