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Llinell 3:
==Ffynonellau==
* Bridge, F. R. a Bullen, Roger (1980) ''The Great Powers and the European States System
* Lowe, John (1988) ''Rivalry and Accord: International Relations
* Lowe, John (1990) ''The Concert of Europe: International Relations
* Seaman, L. C. B. (1988) ''From Vienna to Versailles''. Caergrawnt: Routledge.
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