Bildnachweise
| 3d add storage icon isolated on white | © Mikhail Mishchenko - Fotolia.com |
| 3D - Solar Energy - 01 | © styleuneed - Fotolia.com |
| 3d wind turbines | © Christos Georghiou - Fotolia.com |
| Ablage Kontoauszüge | © Michael S. Schwarzer - Fotolia.com |
| Blank Desk calendar on white | © Sashkin - Fotolia.com |
| Businessman throwing papers | © Viorika Prikhodko - iStockphoto.com |
| Copyshop | © vege - Fotolia.com |
| Corporate buildings from a high angle | © Andres Rodriguez - Fotolia.com |
| Crowd Running Towards Golden Motarboard Cap | © Scott Maxwell - Fotolia.com |
| diploma in scroll on white. 3d | © sad - Fotolia.com |
| Dr. Georg Rau | © Deutsche Post AG |
| Earth with blue satelite isolated on white | © Mikhail Mishchenko - Fotolia.com |
| exhibition stand tradeshow | © Bertold Werkmann - Fotolia.com |
| Fabbrica03pannelliSolari | © imagebos - Fotolia.com |
| Flipchart | © imageteam - Fotolia.com |
| Hunkeler Innovationdays 2011 | © Hunkeler AG |
| Internet Call | © mipan - Fotolia.com |
| Jigsaw puzzle with a missing piece to complete | © llandrea - Fotolia.com |
| Microscope #2 | © Jan Rysavy - iStockphoto.com |