PricewaterhouseCoopers, «15th Annual Global CEO Survey 2012», см.: http://www.pwc.com/gx/en/ceo-survey/pdf/15th-globalpwc-ceo-survey.pdf.
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Gallup, «Majority of American Workers Not Engaged in Their Jobs», 2011, см.: http://www.gallup.com/poll/150383/majority-american-workers-not-engaged-jobs.aspx
