Here are the pages that show and/or discuss the reproduction of the Unger Ödenburg/Sorpon German playing cards by Mátyás Unger:
- http://iparmuzeum.hu/hirek/unger-matyas-kartyainak-reprodukcioja/
- https://www.gyoriszalon.hu/news/19051/66/A-gy%C5%91ri-Ungerek-%C3%A9s-hazafias-magyar-k%C3%A1rty%C3%A1ik
- https://oedenburgerland.de/index.php?option=com_content&view=article&id=1280:oedenburg-die-heimat-der-spielkarten-im-19-jahrhundert&catid=152&Itemid=449
- http://www.cedig.org/igloo/tipologia/oedenburg.html
