Bill Hull covers the topic of discipleship with very few stones unturned. The best thing about this book is that it reads like a reference book. You can read it cover to cover, or simply read sections at a time. That means, no matter where you stand among the ‘different levels of spiritual maturity,’ (p. 256) you will benefit from this book.
The Complete Book of Discipleship: On Being and Making Followers of Christ (Colorado Springs, CO: NavPress, 2006)