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MLA
"What Causes CLL?." Chronic Lymphocytic Leukemia Research Consortium (CRC).12 Apr 2009. <http://cll.ucsd.edu/index.htm>.

"Leukemia - Causes and Symptoms." Washington University School of Medicine. Copyright 2009 Washington University School of Medicine. 12 Apr 2009 <http://wuphysicians.wustl.edu/page.aspx?pageID=382>.

What Causes Leukemia?. 12 Apr 2009 <http://www.montana.edu/wwwai/imsd/cancer/van1/vwriskfactor.htm>.

"LEUKEMIA." Copyright © 2007 - Advameg Inc. . 12 Apr 2009 <http://www.faqs.org/health/Sick-V3/Leukemia.html>.

"UCSF Children." Leukemia . May 5, 2008. Copyright © 2002 - 2009 The Regents of the University of California. 12 Apr 2009 <http://www.ucsfhealth.org/childrens/medical_services/cancer/leukemia/conditions/leukemia/signs.html>.

"American Cancer Society." Benzene. 02 Mar 2006 . Copyright 2009 © American Cancer Society, Inc.. 12 Apr 2009 <http://www.cancer.org/docroot/PED/content/PED_1_3X_Benzene.asp?sitearea=PED>.

Swierzewski, Stanley J. . "Oncology Channel." Leukemia. 04 Dec 2007. © 1998-2009 by Healthcommunities.com, Inc.. 12 Apr 2009 <http://www.oncologychannel.com/leukemias/treatment.shtml>.

Fayed, Lisa . "About.com." Can Leukemia Be Prevented?. 02 June 2006. ©2009 About.com, a part of The New York Times Company.. 12 Apr 2009 <http://cancer.about.com/od/leukemia/a/leukemiaprevent.htm>.

Schoenstadt, Arthur . "MED TV." Early Symptoms of Leukemia. 27 Oct 2006 . 12 Apr 2009 <http://leukemia.emedtv.com/leukemia/early-symptoms-of-leukemia.html>.