Fakhr, Amer, et al. “ANTI-CYCLIC CITRULLINATED PEPTIDE ANTIBODIES IN RHEUMATOID ARTHRITIS PATIENTS: Anti-Cyclic Citrullinated Peptide Antibodies”. Pakistan Armed Forces Medical Journal, vol. 67, no. 1, Oct. 2018, pp. 37-40, https://pafmj.org/PAFMJ/article/view/126.