1. American Psychological Association (APA) 2013 http://www.apa.org/news/press/releases/2013/03/employee-needs.aspx
2. American Psychological Association (APA) Practice Organization 2010 http://www.apa.org/practice/programs/workplace/phwp-fact-sheet.pdf
3. Archinect 2011 http://archinect.com/forum/thread/30733693/anyone-burnt-out
4. Australian Infront 2012 http://www.australianinfront.com.au/forum/thread/i-don-and-039-t-want-to-be-a-graphic-designer-anymore-burning-out
5. Organizational research: Determining appropriate sample size in survey research;Bartlett;Information Technology, Learning, and Performance Journal,2001