Presialia, A., and B. Setyohadi. “Effect of Folic Acid Supplementation for Reducing Methotrexate Side Effects in Patients With Rheumatoid Arthritis: An Evidence-Based Case Report”. Indonesian Journal of Rheumatology, Vol. 12, no. 2, Feb. 2021, pp. 274-8, doi:10.37275/ijr.v12i2.113.