Somerville, H. (2013, May 12). Safeway CEO Steve Burd has legacy as a risktaker. San Jose Mercury News.
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The Economist (2013, September 24). Working hours: Get a life.
См. также Stanford University Department of Computer Science. (n.d.). The relationship between hours worked and productivity. По данным сайта http://www-cs-faculty.stanford.edu/~eroberts/cs181/projects/2004–05/crunchmode/econ-hours-productivity.html.
