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  • Bose Learning Center
    http://www.bose.com/controller?event=VIEW_STATIC_PAGE_EVENT &url=/learning/index.jsp
  • Dennis, Johnnie T. "The Complete Idiot's Guide to Physics." Indianapolis: Alpha Books, 2003.
  • Gundersen, P. Erik. "The Handy Physics Answer Book". Canton, MI: Visible Ink Press, 2003.
  • Holt, J. Gordon. "Audio basics: A is for ampere," Stereophile. March 1991.
    http://stereophile.com/reference/62/
  • Encyclopedia Britannica 2005, s.v. "headphone." CD-ROM, 2005.
  • Encyclopedia Britannica 2005, s.v. "noise." CD-ROM, 2005.
  • Fischetti, M. "Reducing a roar," Scientific American. Exclusive online issue. October 2006.
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  • "A quick guide to headphones." HeadWize.
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  • Sems, Marty. "How noise-canceling headphones work," Smart Computing. January 2004. Volume 15, Issue 1.