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Karp, Theodore. 1988. Compositional Process in Machaut's Ballades'. Music from the Middle Ages through the Twentieth Century: Essays in Honor of Gwynn S. McPeek, Monographs on Musicology. edited by Theodore Karp, 64-78. New York: Gordon and Breach.

Comberiati, Carmelo Peter. 1983. Polyphonic Settings of the Mass Ordinary at the Court of Rudolf II (1576-1612). University of Michigan, Unpublished Ph.D. dissertation.