These books represent a very small selection from a large number of possibilities.  They have been chosen on the basis of availability, quality, and user friendliness.  Titles available from Amazon are directly linked to their site.

Robert A. Johnson's many books are uniformly excellent.  They illustrate how to apply Jung's ideas to various situations and myths.  These two books offer direct guidance in using the Jungian model in our own lives.

Inner Work: Using Dreams and Active Imagination for Personal Growth

Owning Your Own Shadow: Understanding the Dark Side of the Psyche

Agnes Sanford is an example of what might be called a Protestant Saint.  Her down to earth approach to prayer and healing are most useful for forming an intelligent view of these topics.

The Healing Light An uncommonly sensible book on prayer by an expert.

Sealed Orders This is Agnes Sanford's autobiography.  It is a wonderful book.

John Sanford was Agnes Sanford's son, an Episcopalian priest and a Jungian analyst.  He combines Jungian and Christian perspectives in a masterful way.

Dreams: God's Forgotten Language

Kathy Hurley and Theodorre Donson Discover Your Soul Potential : Using the Enneagram to Awaken Spiritual Vitality
A most useful and clear presentation of the Enneagram as a tool for spiritual growth, by two of my teachers.

Helen Palmer The Enneagram: Understanding Yourself and the Others In Your Life
Really the book that started it all and still one of the very best introductions to the subject

Don Richard Riso and Russ Hudson The Wisdom of the Enneagram: The Complete Guide to Psychological and Spiritual Growth for the Nine Personality Types
The latest contribution from two of the leaders in the field. Highly recommended