Fahad, M., R. Hussain, S. Hussain, A. Fatima, and M. Paracha. “Comparison of Efficacy of Metered Dose Inhaler and Dry Powder Inhalation in Treatment of Persistent Asthma”. Annals of Punjab Medical College (APMC), Vol. 12, no. 4, Mar. 2019, doi:10.29054/apmc/2018.4.