COLUMBIA, Md., April 26 /PRNewswire-FirstCall/ -- Arbitron Inc. (NYSE: ARB) announced today that effective with the Spring 2010 Diary survey and the March 2010 Portable People Meter™ ratings service, the company is now including cell phone households that rarely or never answer their landlines
Source : http://www.prnewswire.com/news-releases/arbitron-b...
Source : http://www.prnewswire.com/news-releases/arbitron-b...