A practical guide to "Musica ficta" based on an analysis of sharps found in the music prints of Ottaviano Petrucci, (1501 - 1519) - Carvell, Bruce R. (1982)
Mikrofilm, erschienen im Verl. Univ. Microfilms Internat., Ann Arbor, Mich. - Washington, Univ., Diss.