Which Kindle do I have? A quick guide to identifying Amazon's e-readers
Review: The 2011 $79 Kindle 4 with ads and buttons – Marco.org
The latest Kindle Paperwhite is arguably the best ebook reader around with a larger display, smoother UI and excellent battery backup.
Kindle 4 vs Kindle 3 Keyboard Comparison Review - YouTube
Kindle Basic 2013 vs Kindle Basic Touch 2014 - Good e-Reader
Amazon.com: International Version – Kindle Paperwhite – (previous generation - 2018 release) Now Waterproof with more than 2x the Storage - 32 GB, Free 4G LTE + Wi-Fi : Electronics