K. H. · Karl H. · Karl Häffner
| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| Out of the Hot Tub, Into the World: The Cure for Comfort-Zone Christianity | 978-0-8163-1902-2 (0-8163-1902-2) | 2002 |
| Soul Matters | 978-0-8163-2150-6 (0-8163-2150-7) | 2006 |
| The Cure for Soul Fatigue: Spiritual Healing for the Worn Out, Stressed Out, and Burned Out | 978-0-8163-1840-7 (0-8163-1840-9) | 2001 |