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* {{cite book |ref=harv |last=Morris |first=R. |title=The fundamentals of product design |year=2009 |publisher=AVA Publishing |___location= |isbn=2-940373-17-5 }}
* {{cite book |ref=harv |last=Norman |first=D. |title=The design of everyday things |year=2002|publisher=Basic Books |___location=New York |isbn=0-465-06710-7 }}
== External links ==
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