http://www.impulse-research.com/prlist.html
 http://www.odwyerpr.com/default.htm
 http://publicrelations.about.com
 http://advertising.utexas.edu/world/PR.html#To
 http://lamar.colostate.edu/~pr
 http://www.prplace.com/
 http://www.prweb.com/
 http://www.online-pr.com/
 http://www.prcentral.com/
 http://www.prsawis.org
 http://www.phillips.com/iprmn.htm
 http://www.phillips.com/prnews.htm