Turgeon, Mary Louise. Clinical hematology: theory and procedures. Hagerstown, MD: Lippincott Williams & Wilkins. 2005: 283. ISBN 0-7817-5007-5. Frequency of lymphoid neoplasms. (Source: Modified from WHO Blue Book on Tumour of Hematopoietic and Lymphoid Tissues. 2001, p. 2001.)