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- Curtis, Liane . "Mode". In Companion to Medieval and Renaissance Music, edited by Tess Knighton and David Fallows. Berkeley: University of California Press. . (en)
- Apel, Willi . The Notation of Polyphonic Music, 900–1600, fifth edition, revised and with commentary. Publications of the Mediaeval Academy of America, no. 38. Cambridge, Massachusetts: Mediaeval Academy of America. (en)
- Roesner, Edward H. . "Rhythmic Modes [Modal Rhythm]". The New Grove Dictionary of Music and Musicians, second edition, edited by Stanley Sadie and John Tyrrell. London: Macmillan. (en)
- Reese, Gustave . Music in the Middle Ages: With an Introduction on the Music of Ancient Times. New York: W. W. Norton. . (en)
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