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http://investor.google.com/fin_data.html
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http://www.techcrunch.com/2009/01/28/google-gobbled-up-90-percent-of-all-us-search-growth-in-2008/
http://www.businessweek.com/magazine/content/07_32/b4045417.htm
http://www.vertygoteam.com/google_marketing_strategy.php
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Kelsey Group
Datamonitor
eMarketer
New York Times
Google.com
Crane, Kerin, Hartley & Rudelius, Marketing 7th Canadian Edition
ProQuest: ABI/INFORM Dateline, ABI/INFORM Global, ABI/INFORM Trade & Industry