Freed 1984, p. 58. Freed, John B. (1984), "The Counts of Falkenstein: Noble Self-Consciousness in Twelfth-Century Germany", Transactions of the American Philosophical Society, 74 (6), American Philosophical Society: 1–70, doi:10.2307/1006394, JSTOR1006394
jstor.org
Freed 1984, p. 58. Freed, John B. (1984), "The Counts of Falkenstein: Noble Self-Consciousness in Twelfth-Century Germany", Transactions of the American Philosophical Society, 74 (6), American Philosophical Society: 1–70, doi:10.2307/1006394, JSTOR1006394
Rosenfeld 1955–1956, p. 262. Rosenfeld, Hellmut (1955–1956), "Die Inschrift des Helms von Negau", Zeitschrift für Deutsches Altertum und Deutsche Literatur (in German), 86 (4), S. Hirzel Verlag: 241–265, JSTOR20654760
Schopf 1997, p. 9. Schopf, Hubert (1997), "Augustinian Canons", in Peter Dinzelbacher und James Lester Hogg (ed.), Kulturgeschichte der christlichen Orden in Einzeldarstellungen, Translated by Theodore J. Antry, O. Praem., Stuttgart: Alfred Kröner Verlag, retrieved 2018-11-09
