| Directory of Open Access Books/Browse by Subject | freie wiss. Volltexte |
| Economic Commons | free access to full-text scholarly articles and other research from hundreds of universities and colleges worldwide. |
| OA databases Engineering Sciences | Datenbankliste |
| OpenAIRE | freie wiss. Volltexte |
| BASE-Search | überwiegend freie wiss. Volltexte |
Überblick
Inhalte