1. E. A. Locke and G. P. Latham, “Building a Practically Useful Theory of Goal Setting and Task Motivation: A 35-Year Odyssey,” American Psychologist, September 2002, p. 706.

2. American Psychological Association (APA) poll conducted by Harris Interactive between April 7 and 15, 2008, “Economy and Money Top Causes of Stress for Americans,” .

3. CareerBuilder.com survey conducted by Harris Interactive between May 22 and June 13, 2008, “One in Five Employers Use Social Networking Sites to Research Job Candidates,” September 10, 2008, .

6. Reid Hoffman, LinkedIn cofounder, interviewed on The Charlie Rose Show, March 4, 2009, .