Arif, A., and A. Sutjipto. “A Study of Aplastic Anemia at the Department of Child Health, School of Medicine University of North Sumatera/Dr. Pirngadi Hospital, Medan”. Paediatrica Indonesiana, Vol. 31, no. 9-10, Jan. 2019, pp. 253-60, doi:10.14238/pi31.9-10.1991.253-60.