Otto of Freising. (1953). The deeds of Frederick Barbarossa. New York: Columbia University Press.
Trích dẫn kiểu ChicagoOtto of Freising. The Deeds of Frederick Barbarossa. New York: Columbia University Press, 1953.
Deismireacht MLAOtto of Freising. The Deeds of Frederick Barbarossa. New York: Columbia University Press, 1953.
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