*{{sourcefonte|url=http://us.cnn.com/2006/POLITICS/07/19/stemcells.veto/index.html|titletítulo=Bush vetoes embryonic stem-cell bill|authorautor=|pub=CNN|datedata=July 19, de julho de 2006}}
*{{sourcefonte|url=http://www.nytimes.com/2006/07/19/washington/19cnd-stem.html?hp&ex=1153368000&en=c59f214cb1301b12&ei=5094&partner=homepage|titletítulo=In First Veto, Bush Blocks Stem Cell Bill|authorautor=DAVID STOUT|pub=The New York Times|datedata=July 19, de julho de 2006}}