The main documentation for MINIX 3 is the book Operating Systems: Design and Implementation 3/e by Andrew S. Tanenbaum and Albert S. Woodhull, Prentice Hall, 2006. The image at the right is a link to the book at amazon.com.

This book discusses operating systems in general, and MINIX 3 in particular. A large piece of the source code is listed in Appendix B and is described in detail in the text. The listing is available in various formats. The files, functions, and #defines are indexed. The version of the code listed in the appendix is available as a tar file.

Although book is book is still probably the best place to start if you really want to learn all the details of the code, it describes MINIX 3.1.0, which is quite old now, rather than the current 3.2.0 release.