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7Yvonne Rogers, Helen Sharp, and Jenny Preece, Interaction Design. Beyond Human- Computer Interaction, Third Edition, John Wiley & Son Ltd, 2011. P47.
8Graham, George, "Behaviorism", The Stanford Encyclopedia of Philosophy (Fall 2010 Edition), Edward N. Zalta (ed.).
9Norman, Donald. The Psychology of Everyday Things. Basic Book, 1988.
