| title | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) |
|---|---|---|---|
| The Invisible Edge: Taking Your Strategy to the Next Level Using Intellectual Property | 978-1-59184-237-8 (1-59184-237-9) | 2009 | Mark Blaxill |
R. E. · Ralf Eckert · Ralf Eggert · Ralph Eckert · Ralph Eckhardt