APA aipamena

Otto of Freising. (1953). The deeds of Frederick Barbarossa. New York: Columbia University Press.

Chicago Style aipamena

Otto of Freising. The Deeds of Frederick Barbarossa. New York: Columbia University Press, 1953.

MLA aipamena

Otto of Freising. The Deeds of Frederick Barbarossa. New York: Columbia University Press, 1953.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.