Murtadha, . O., and E. A. H. Alalwany. “A Comparative, Histomorphological and Histochemical Study of Lower Respiratory System at Different Ages Postnatally in Male Albino Rats”. International Journal of Health Sciences, vol. 6, no. S7, Sept. 2022, pp. 4224-32, doi:10.53730/ijhs.v6nS7.12794.