http://www.psiusa.com/
http://company.monster.com/proservi/
http://www.psiusa.com/news/news.aspx?nid=10
http://www.bxmagazine.com/article.asp?ID=516
http://www.jigsaw.com/id235637/professional_service_industries_inc_company.xhtml
http://www.topix.com/content/prweb/2009/09/fieldturf-partners-with-professional-service-industries-to-further