Recommended Book: Mosaic Knitting by Barbara Walker
The definitive guide to mosaic knitting, by mosaic inventor Barbara Walker. The book contains a thorough explanation of how slip-stitch knitting (knitting with one color in each row) works and why. Includes written patterns and charts for 380 mosaic designs that you can add to your own projects.
This is the book I studied from before creating our own video course on the topic.