Universal Principles of Design. (2010, March). California Bookwatch. Retrieved from http://go.galegroup.com.ezproxy.ecu.edu.au/ps/i.do?id=GALE%7CA221271162&v=2.1&u=cowan&it=r&p=AONE&sw=w&asid=25ab0661d469f02866f32c1dfab5c8a1
Lidwell, W., Holden, K., & Butler, J. (2010). Universal principles of design. Rockport Publishers.
Spool, J. (2005). Consistency in Design is the Wrong Approach Retrieved 2nd of November 2014, from http://www.uie.com/brainsparks/2005/09/15/consistency-in-design-is-the-wrong-approach/
Horton, S. (2006). Apply a Consistent Design. Retrieved 2nd of November 2014, 2014, from http://universalusability.com/access_by_design/page_layout/consistent.html
Jordan, P. W. (1993). Consistency and usability. (Order No. U058175, University of Glasgow (United Kingdom)). PQDT – UK & Ireland, Retrieved from http://ezproxy.ecu.edu.au/login?url=http://search.proquest.com/docview/301537863?accountid=10675. (301537863).