Saffer,D. (2006) Elements of Interaction Design UX Matters Viewed: March 30, 2007 < http://www.uxmatters.com/MT/archives/000096.php>
Malouf, D (2006) “Elements of Interaction Design” Synaptic Burn Viewed: March 30, 2007 < http://synapticburn.com/comments.php?id=143_0_1_0_C>