↑ A. Małecki, Studya heraldyczne [Heraldic Studies], vol. I, Lwów 1890, pp. 268-285; M. L. Wójcik, Ród Gryfitów do końca XIII wieku. Pochodzenie — genealogia — rozsiedlenie, Historia CVII, Wrocław 1993, p. 39.
↑ Nora Berend, Przemysław Urbańczyk and Przemysław Wiszewski, Central Europe in the High Middle Ages: Bohemia, Hungary and Poland, c.900–c.1300 (Cambridge University Press, 2013).
↑ Gerald Stone, Slav Outposts in Central European History: The Wends, Sorbs and Kashubs (Bloomsbury, 2016).
↑ Robert von Friedeburg, Self-Defence and Religious Strife in Early Modern Europe: England and Germany, 1530-1680 (Routledge, 2002)
