Directory of Open Access Books (link1, link 2)
Directory of Open Access Journals
One of the largest online collections of academic books, that are available to read for free and have undergone peer review. Over 11,000 volumes from more than 60 leading university presses.
The Repository Common Search Service
ERIC is an online library of education research and information, sponsored by the Institute of Education Sciences (IES) of the U.S. Department of Education.
Die FIS Bildung Literaturdatenbank bietet Literaturnachweise zu allen Teilbereichen des Bildungswesens.
Searchable and citable electronic archives and database of periodicals
Open Journal Systems alapú hazai digitális folyóiratok közös keresője
A collection of Hungary-related digital documents of scientific or cultural importance
The European Digital Library
The world’s largest collection of open access research papers
The National Educational Library and Museum of Hungary
The National Common Catalogue of Hungary