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1. Leander Kahney, "Inside Look at Birth of the iPod," Wired, 21 July 2004.
2. Tom Hornby and Dan Knight, "A History of the iPod," Orchard, September 2007.
3. Janice Steinberg, "The 800-lb. Gorilla," San Diego Union–Tribune, 19 January 2006.
4. Marty Neumeier, The Brand Gap: How to Bridge the Distance Between Business Strategy and Design (Peachpit Press, 2005).