If you prefer the Kindle ecosystem, these titles are almost always available on the Amazon Kindle Store. You can read them on your tablet, PC, or phone, and the content is synced across devices.
A free, community-driven resource (Version 2.0) that offers over 150 pages of step-by-step guidance on setting up development environments, creating your first extension, and handling reports. It is available for free download via GitHub. If you prefer the Kindle ecosystem, these titles
If you want the digital version of the book legally, here is where you should look: If you prefer the Kindle ecosystem