| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| Invoice Verification for SAP R/3: SAP PRESS Essentials 17 | 978-1-59229-083-3 (1-59229-083-3) | 2006 |
| Invoice Verification for SAP: SAP MM and FI | 978-1-59229-186-1 (1-59229-186-4) | 2007 |
| SAP: A Map of the Minefield | 978-1-4208-7387-0 (1-4208-7387-3) | 2005 |