| title | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) | |
|---|---|---|---|---|
| Die Heilende Kraft des Gebets | 978-3-9809836-0-0 (3-9809836-0-9) | 2005 | Harold G. Koenig | |
| Proven Principles for Finding Funds | 978-0-8010-9148-3 (0-8010-9148-9) | 2002 | ||
| The Healing Power of Prayer: The Surprising Connection between Prayer and Your Health | 978-0-8010-6524-8 (0-8010-6524-0) | 2004 | Harold G. Koenig | |