Bias RG, Mayhew DJ. Cost-justifying usability: An update for the Internet age. 2nd ed. San Francisco, CA: Morgan Kaufmann Publishers; 2005.
Burns M, Manning H, Petersen J. The business impact of customer experience, 2012. Business case: The experience-driven organization playbook. Cambridge, MA: Forrester; 2012. http://www.forrester.com/The+Business+Impact+Of+Customer+Experience+2012/fulltext/-/E-RES61251.
Farrell S, Nielsen J. User experience career advice: How to learn UX and get a job. 2014. Retrieved from http://www.nngroup.com/reports/user-experience-careers/.
Forrester’s North American Technographics Customer Experience Online Survey, Q4. 2011 (US).
Gould JD, Lewis C. ...