Federico Guglielmo I di Brandeburgo (Italian Wikipedia)

Analysis of information sources in references of the Wikipedia article "Federico Guglielmo I di Brandeburgo" in Italian language version.

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archive.org

Christopher M. Clark, Iron kingdom: the rise and downfall of Prussia, 1600–1947, Harvard University Press, 2006, p. 50, ISBN 0-674-02385-4.
Hajo Holborn, A History of Modern Germany: 1648–1840, A History of Modern Germany, vol. 2, Princeton University Press, 1982, p. 57, ISBN 0-691-00796-9.