1. http://www.fda.gov/AboutFDA/WhatWeDo/ History/Origin/ucm054819.htm
2. http:www.thalidomidesociety.co.uk/thalhistory.htm
3. Drug embryopathy: the thalidomide story;Kelsey;MD State Med J,1963
4. Policy developments in regulatory approval;Temple;Stat Med,2002