Ratnaningsih, T., N. W. Sukirto, and A. T. Wahyuningsih. “Soluble Transferrin Receptor (sTfR) Identifies Iron Deficiency Anemia (IDA) in Pulmonary Tuberculosis Patients”. Acta Medica Indonesiana, vol. 52, no. 4, Dec. 2020, p. 334, https://www.actamedindones.org/index.php/ijim/article/view/1262.