Bukhari, Q.- ul-A. ., M. . Khan, K. M. . Mirza, and M. H. . Dar. “Comparative Effects of Combination Therapies; Methotrexate With Leflunomide &Amp; Sulfasalazine in the Treatment of Rheumatoid Arthritis”. Journal of Bahria University Medical and Dental College, vol. 7, no. 2, June 2017, pp. 102-6, https://jbumdc.bahria.edu.pk/index.php/ojs/article/view/245.