1 Wikipedia the Free Encyclopedia. Wikimedia Foundation, Inc., 2004. Web. April 30, 2014.
2-9 Google/Ipsos MediaCT/Purchased, Research: Understanding Consumers' Local Search Behavior, May 2014.

Methodology: Google partnered with Ipsos MediaCT and Purchased® on two custom studies across nine verticals to uncover consumers’ local search behavior on computers/tablets and smartphones. All participants were smartphone users aged 18+ who conducted smartphone searches at least a few times per week. The Ipsos Online Survey was administered January 10–22, 2014. We recruited 4,500 respondents to complete one of the nine vertical-specific surveys, and the sample size was set at n=500 in each vertical surveyed. The Purchased Shopper Smartphone Diary was administered December 18, 2013–January 30, 2014. There were 653 respondents. In total, 3,431 smartphone searches and 2,262 store visits were logged and analyzed.