The following sources were cited in SAP Digital Futures Issue 11 Flowing Into High Business Performance

Worldwide, only 13% of employees are fully involved in and enthusiastic about their jobs.
Steve Crabtree, “Worldwide, 13% of Employees Are Engaged at Work,” Gallup Inc., October 3, 2013 http://www.gallup.com/poll/165269/worldwide-employees-engaged-work.aspx.

While “in flow,” business executives report a five-fold increase in productivity.
Susie Cranston and Scott Keller, “Increasing the ‘Meaning Quotient’ of Work,” McKinsey Quarterly, January 2013, http://www.mckinsey.com/insights/organization/increasing_the_meaning_quotient_of_work.

Military snipers who trained in a flow state learned skills 230% faster.
Steven Kotler, “Create a Work Environment That Fosters Flow,” Harvard Business Review, May 6, 2014, https://hbr.org/2014/05/create-a-work-environment-that-fosters-flow/.

Research has discovered 17 triggers that speed entrance into the flow state.
Steve Kotler, “The Rise of Superman: 17 Flow Triggers” (PowerPoint deck), SlideShare posted March 3, 2014, http://www.slideshare.net/StevenKotler/17-flow-triggers.

 Companies that have employees revisit their goals at least quarterly are 3.5 times more likely to be top performers in their industry.
“Bersin by Deloitte: Effective Employee Goal Management Is Linked to Strong Business Outcomes” (press release), PR Newswire, , December 17, 2014, http://www.prnewswire.com/news-releases/bersin-by-deloitte-effective-employee-goal-management-is-linked-to-strong-business-outcomes-300011399.html.