http://www.mrmcmed.org/Critical_Look.pdf

http://caat.jhsph.edu/pubs/animal_alts/chap5.htm

http://seattlepi.nwsource.com/opinion/lead16.shtml

http://www.allforanimals.com/alternatives1.htm

http://www.bbc.co.uk/science/hottopics/animalexperiments/index.shtml

http://cats.about.com/cs/advocacy/a/vivisection.htm