Firas, A. T., and A. F. Ilham. “Effect of Maintenance Therapy for Childhood With Acute Lymphoblastic Leukaemia by Combination of Methotrexate and 6–mercaptopurine on the Liver”. Al Mustansiriyah Journal of Pharmaceutical Sciences, vol. 2, no. 2, Dec. 2005, pp. 18-23, doi:10.32947/ajps.v2i2.430.