What are the differences between the third generation iPod nano models? What are the differences between these models and the models they replaced?: EveryiPod.com
The iPod nano had a weird, amazing history - The Verge
iPod Nano 4th Generation Teardown - iFixit
Apple iPod Nano (5th generation) review: Apple iPod Nano (5th generation) - CNET
iPod Nano 3rd Generation Repair - iFixit
iPod Nano - Wikiwand
Apple 8GB iPod nano (Silver) MC027LL/A B&H Photo Video
Apple iPod Nano 4th Generation 16GB Red MP3 Player, Excellent Condition - Walmart.com