Inam, Asma, Nazish Sadiq, Summyah Niazi, Rakhshanda Naheed, Amber Asfandyar, and Fouzia Qadir. “The Physiologic and Biochemical Effects of Vitamin C in Patients With Chronic Obstructive Pulmonary Disease: A Systematic Review”. Pakistan Journal of Chest Medicine 27, no. 4 (December 2, 2021): 364–372. Accessed December 16, 2025. https://www.pjcm.net/index.php/pjcm/article/view/605.