1. (a)www.fda.gov/∼Ird/history.
2. (b)http://www.fda.gov/oc/history/historyoffda/.
3. (c)BergerMS.FDA enforcement manual FDA group Thompson Publishing group. Available athttp://www.emedicinehealth.com/script/main/art.asp?articlekey=59287&page=1.
4. The history and contemporary challenges of the US Food and Drug Administration