| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| Global Environment Outlook GEO 4: Environment for Development | 978-92-807-2836-1 (92-807-2836-9) | 2007 |
| Switched on Renewable Energy Opportunities in the Tourism Industry | 978-92-807-2330-4 (92-807-2330-8) | 2003 |