1012) Evert A. Duyckinick, Portrait Gallery of Eminent Men and Women in Europe and America, New York, Johnson, Wilson & Company, 1873. Altri progetti Wikimedia
Cambridge University Press, p. 3, ISBN 0-521-55917-0. (EN) Norman Davies, Europe: A History, Oxford University Press, 1996, p. 554, ISBN 0-195-20912-5. (EN)
2000-ig, Pannonica, 2002, ISBN 96-39-25256-5. (EN) Richard C. Frucht, Eastern Europe: An Introduction to the People, Lands, and Culture, ABC-CLIO, 2005, ISBN 1-576-07800-0