History of Poland - Reformation and Counterreforma
The Protestant Reformation and the Golden Age in Poland.
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.
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.
The History of Protestantism
Book 19 of Wylie's work, covering the history of Protestantism in Poland and Bohemia
The History of Protestantism
Book 20 of Wylie's work, covering the history of Protestantism in Hungary and Transylvania.
The Reformation In Hungary
A short history of the Protestant Reformation, including the Lutherans, the Calvinists and the Antitrinitarians (unitarians.)