History of Poland - Reformation and Counterreformation
- The Protestant Reformation and the Golden Age in Poland.
- http://www.zum.de/whkmla/region/eceurope/refpol.html

The History of Protestantism
- Book 20 of Wylie's work, covering the history of Protestantism in Hungary and Transylvania.
- http://www.doctrine.org/history/HPv3b20.htm

The Development of the Reformed Church in Romania
- Although the Reformation first began in Romania as a Lutheran movement, from 1550 on it became more Reformed and in 1564 the Reformed Church began there.
- http://www.reformiert-online.net:8080/t/eng/bildung/grundkurs/gesch/lek5/index8.jsp

The Reformation In Hungary
- A short history of the Protestant Reformation, including the Lutherans, the Calvinists and the Antitrinitarians (unitarians.)
- http://www.zum.de/whkmla/region/eceurope/hungaryref.html

The Forgotten Reformations in Eastern Europe
- Although incomplete, this site has a number of links to sites describing the Reformation in such countries as Romania and Hungary.
- http://www.eldrbarry.net/heidel/eeurorsc.htm