M. K. · Marcus Krekeler · Markus Kirkilionis
| title | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) | |
|---|---|---|---|---|
| Service mit SAP CRM | 978-3-8362-1060-7 (3-8362-1060-6) | 2008 | Dirk Manhart · Jörg Unger | |
| Service with SAP CRM | 978-1-59229-206-6 (1-59229-206-2) | 2009 | Dirk Manhart |