One of my most-used Atari 8-bit books was Your Atari Computer by Lon Poole, Martin McNiff and Steven Cook. First published in 1982, this book was a one-stop-shop for Atari knowledge!
The title could not be more accurate as the book covered everything you needed to know to make use of your Atari computer!
With 11 chapters and 9 appendices, there was not much that was missing.
View Your Atari Computer (XL Edition) on the Internet Archive.