Ahmad, Ausaf, et al. “Discriminant Analysis of Rheumatoid Factor, Anti-Cyclic Citrullinated Peptide, and C-Reactive Protein for Rheumatoid Arthritis Patients”. National Journal of Community Medicine, vol. 8, no. 03, Mar. 2017, pp. 148-52, https://njcmindia.com/index.php/file/article/view/624.