Esber, N., and T. Schulz. “Leukemic Meningitis in Chronic Lymphocytic Leukemia: A Rare Condition Responding to Intrathecal Methotrexate”. Kansas Journal of Medicine, vol. 2, no. 4, Sept. 2009, pp. 96-98, doi:10.17161/kjm.v2i4.11303.