User manual Celestron Nexstar Evolution 8" Telescope and Accessory Kit | PDF-MANUALS.com
The NexStar Evolution and SkyPortal User's Guide (The Patrick Moore Practical Astronomy Series): Chen, James L., Chen, Adam: 9783319325385: Amazon.com: Books
The NexStar Evolution and SkyPortal User's Guide (The Patrick Moore Practical Astronomy Series): Chen, James L., Chen, Adam: 9783319325385: Amazon.com: Books