http://www.philly.com/philly/blogs/greenliving/133242553.html

http://philly.citybizlist.com/2/2011/10/18/Electric-Car-Charging-Stations-Installed-at-Pennsylvania-Convention-Center-Parking-Lot.aspx

http://www.philly.com/philly/business/homepage/20111027_Center_City_garage_installs_vehicle_charging_stations.html

http://www.philly.com/philly/business/20111028_Business_news_in_brief.html