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Sourceshttp://blogs.wsj.com/marketbeat/2012/01/23/google-leans-on-rivals-for-revenue/

http://www.emarketer.com/newsroom/index.php/digital-ad-spending-top-37-billion-2012-market-consolidates/

http://see.tritonmedia.com/Media/Default/Documents/2012-06-01-Media-Influence-Survey.pdf

http://blog.nielsen.com/nielsenwire/mediauniverse/

http://www.nielsen.com/content/dam/corporate/us/en/reports-downloads/2011-Reports/TrendsAdSpendanEffectiveness_Spreads.pdf

http://www.nielsen.com/content/dam/corporate/us/en/reports-downloads/2012-Reports/Nielsen-Cross-Platform-Report-Q1-2012-final.pdf

http://blog.nielsen.com/nielsenwire/wp-content/uploads/2012/05/Nielsen-Adv-Aud-by-MediaType-Spring-2012.pdf