Fellin, Eugene C. 1978. The Notation-Types of Trecento Music. L'Ars Nova Italiana del Trecento IV, 211-23.

Fellin, Eugene C. 1973. Le relazioni tra i manoscritti musicali del Trecento. Rivisita Italiana di Musicologica, 165–80.

Fellin, Eugene C. 1970. A Study of Superius Variants in the Sources of Italian Trecento Music: Madrigals and Cacce. University of Wisconsin, Ph.D. dissertation, 4 vols.