Saifullah, S., A. Ihsan, S. H. A. Shah, A. Iftikhar, M. H. A. Khan, and N. Pervez. “Role of Serum and Dietary Vitamins A and E in Pulmonary Function and Chronic Obstructive Pulmonary Disease: A Systematic Review: Role of Vitamins A and E in Pulmonary Function and Disease”. Pakistan Journal of Health Sciences, vol. 6, no. 2, Feb. 2025, doi:10.54393/pjhs.v6i2.2817.