Graham Cooke writes beautiful pieces about how to hear the voice of God well and with character:
Prophetic Wisdom
Approaching the Heart of Prophecy
This was the first book aside from the Bible that I read about hearing the voice of God:
Surprised by the Voice of God
Abraham Heschel is a Jewish scholar who writes about the prophets:
The Prophets
Thunder in the Soul
These two books are about interpreting scripture in a healthy way:
Scripture and the Authority of God
Inspiration and Incarnation
This is a classic on the spiritual realm:
The Unseen Realm
These are the two commentaries I relied upon when creating this course:
Interpretation Commentary, Achtemeier and Limburg
We hear as clearly as we are healed. These are two classics on emotional health
Forgiving What You Can't Forget
Emotionally Healthy Spirituality
This is an inspirational series of a modern day man who was an evangelist who heard from God:
Lonnie Frisbee, Trilogy