Alpha International · Gerth Medien
| title | ISBN-13 | year of publication | |
|---|---|---|---|
| Alpha Course Guest Manual: Camouflage Desert Style | 978-1-905887-07-1 | 2011 | |
| Dem Sinn des Lebens auf der Spur - Trainingshandbuch: Der Alpha-Kurs. | 978-3-86591-243-5 | 2011 | |
| God at Work Course Leaders' Guide | 978-1-905887-22-4 | 2011 | |
| The Alpha Course Introductory Guide | 978-1-898838-69-2 | 1997 | |
| The Alpha Course Manual | 978-1-904074-23-6 | 2004 | |
| The Marriage Course: Guest Manual | 978-1-905887-20-0 | 2009 |