Dolores Pesce, ed. and trans. Guido d'Arezzo's Regule rithmice, Prologus in antiphonarium, and Epistola ad Michahelem: A Critical Text and Translation, with an Introduction, Annotations, Indices, and New Manuscript Inventories. Musicological Studies 73. Ottawa: The Institute of Mediaeval Music, 1999. ISBN 1 896926 18 5.
Gabriela Ilnitchi
Plainsong & Medieval Music