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Sources
- Gadget Reviews. "Ear Muff Headphones." July 13, 2006. (Accessed 1/27/2009) http://www.gadgets-reviews.com/index.php?page=post&id=93
- Perfect Present. "180s Behind the Head Earmuffs." (Accessed 1/28/2009) http://www.the-perfect-present.com/Foldable_Earmuffs_Ear_Warmers/earmuffs.html
- Sony. "Sony Celebrates Walkman 20th Anniversary." July 1, 1999. (Accessed 1/27/2009) http://www.sony.net/SonyInfo/News/Press_Archive/199907/99-059/
