| title | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) | |
|---|---|---|---|---|
| Jakarta Commons | 978-3-935042-60-4 (3-935042-60-4) | 2004 | Henrik Hörning · Torsten Curdt | |
| The Definitive Guide to db4o | 978-1-59059-656-2 (1-59059-656-0) | 2006 | Stefan Edlich · Henrik Hörning · Jim Paterson |