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The page contains a serious mistake. There are no Romanian Calvinists in fact,but only Hungarians be they ethnic ones. The gross mistake of the page is that it does not list the Hungarians. And let me say the people you list under 'Romanian Calvinists' are just a marginal fringe. Though some Wikipedia pages in English language contains some reference to the Hungarian Church: http://en.wikipedia.org/wiki/Reformed_Church_in_Hungary

If you want to read something on the past of Hungarian Calvinist read: Calvinism on the Frontier, 1600-1660: International Calvinism and the Reformed Church in Hungary, By Graeme Murdock http://books.google.com/books?id=UESVpu-do8sC

Hungarian Calvinist refer themselves always as Hungarians (Magyars) be they living in Hungary,Romania,Slovakia,Slovenia,Ukraine,Croatia,Serbia. The language used by their churches is always Hungarian.

So by your strange logic you should list:

• Slovakian Calvinists
• Croatian Calvinists
• Slovenian Calvinists
• Serbian Calvinists
• Ukrainian Calvinists

and so on.

So it would better for you to list only the Hungarian for them as they stem from the same historical Hungarian Church and community and the language used by them is only Hungarian.