The page contains a serious mistake. There are no Romanian Calvinists in fact,but only Hungarians be they ethnic ones. 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.
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