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^Robert von Friedeburg, 《Self-Defence and Religious Strife in Early Modern Europe: England and Germany, 1530–1680》 (Routledge, 2002)
^E. J. Feuchtwanger, 《Prussia: Myth and Reality — The Role of Prussia in German History》 (Wolff, 1970).
^F. L. Carsten, 《Origins of Prussia》 (Clarendon Press, 1954).
^Gerald Stone, Slav Outposts in Central European History: The Wends, Sorbs and Kashubs (Bloomsbury, 2016).
^M. L. Wójcik, Ród Gryfitów do końca XIII wieku. Pochodzenie — genealogia — rozsiedlenie [Griffin Dynasty Till the End of the 13th Century. Roots – Genealogy – Location], Historia CVII, Wrocław 1993