Outside Sources for Blindness

http://dsq-sds.org/article/view/688/865

http://www.tandfonline.com/doi/abs/10.3200/CRIT.45.3.293-308?journalCode=vcrt20#.VBhNCv4cy70

http://www.tandfonline.com/doi/abs/10.3200/EXPL.64.2.119-121?journalCode=vexp20#.VBhNcP4cy70

http://www.tandfonline.com/doi/abs/10.1080/07494460600647543#.VBhNlf4cy70

http://jco.ascopubs.org/content/30/25/3141.short