This digital download provides all the information you need to build a simple bookcase, with or without doors. You'll get a complete parts lists, 10 dimensioned CAD drawings, step-by-step assembly instructions, an illustration of frame and panel door construction, plus an animation to help you understand cabinet door anatomy.
The PDF instructions will walk you through assembly of the bookcase, and the cut list includes the optional door parts.
To build this simple bookcase, you'll need a table saw or circular saw. A miter saw is helpful, but not necessary. You'll also need a drill/driver for assembly and a pocket-hole jig (these are about $20).