http://baretta.calpoly.edu/cano/bact-article.html

http://www.cellsalive.com/cam2.htm

http://www.ucmp.berkeley.edu/bacteria/bacteria.html

http://www.healthydays.com/antibiotic_resistant_bacteria.html

http://biology.miningco.com/msubbacteria.htm?TMog=61903777692733m&Mint=751000617115020

http://www.ulster.net/~mycoman/rbactnot.html