File:SONY NW-S14.jpg - Wikipedia
List of Sony Walkman products - Wikipedia
Sony NW-E003 (1GB) review: Sony NW-E003 (1GB) - CNET
File:Sony Xperia S Front.jpg - Wikimedia Commons
Sony Network Walkman™ NW-E99 1GB portable MP3/ATRAC3™ player at Crutchfield
File:Akai APRC-90.jpg - Wikimedia Commons
MiniDisc Buyer's Guide [MiniDisc Wiki]
File:Sony Walkman NWZ-B183.jpg - Wikipedia
List of Sony Walkman products - Wikipedia
File:SONY WALKMAN NWD-W202.jpg - Wikimedia Commons
File:Mp4 player 1 zear.jpg - Wikimedia Commons
File:Sony Walkman S Series.jpg - Wikipedia
Sony MZ-N1 [MiniDisc Wiki]