Shaimaa Hameed Hassan. “Comparative Histological Study of Different Age – Related Changes in the Respiratory System in Sprague-Dawley Rats”. World of Medicine : Journal of Biomedical Sciences, vol. 3, no. 1, Jan. 2026, pp. 65-69, https://wom.semanticjournals.org/index.php/biomed/article/view/613.