Raj, Rishi, and Kenneth Nugent. “Leflunomide-Induced Interstitial Lung Disease (a Systematic Review)”. Sarcoidosis, Vasculitis and Diffuse Lung Diseases, vol. 30, no. 3, Nov. 2013, pp. 167-76, https://mattioli1885journals.com/index.php/sarcoidosis/article/view/2837.