- Albanian National Library
- Bosnian National and University Library
- Bulgarian National Library
- National Library Cyprus
- National Library Northern Cyprus
- Greek National library
- National and University Library of Kosova/Kosovo
- Croatian National and University Library
- Macedonan National and University Library, COBISS
- National Library of the Republic of Moldova
- Central National Library of Montenegro
- Romanian National Library
- National Library of Serbia
- Slovenian National Library, COBISS
- Turkish National Library