The Harvest Book Table is a great place to find Discipling Resources.
Discipling: How to Help Others Follow Jesus by Mark Dever
One to One Bible Reading: A Simple Guide for Every Christian by David Helm
Design for Discipleship Series (DFD) includes 7 books
Your Life in Christ
The Spirit-Filled Follower of Jesus
Walking with Christ
The Character of a Follower of Jesus
Foundations for Faith
Growing in Discipleship
Our Hope in Christ
Published by NavPress