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2. On Creativity;Tusa,2003
3. Merriam Webster (2015). Dictionary: Merriam Webster. From Merriam Webster Web site: http://www.merriam-webster.com/dictionary/creativity.
4. Wikipedia (2015). Creativity: Wikipedia. From Wikipedia Web site: https://en.wikipedia.org/wiki/Creativity.
5. Management and Creativity;Bilton,2007