SNOJ, J. The Ljubljana Handwritten Copy of Tractates by Guido of Arezzo. Musicological Annual, [S. l.], v. 28, n. 1, p. 63–71, 1992. DOI: 10.4312/mz.28.1.63-71. Disponível em: https://revije.ff.uni-lj.si/MuzikoloskiZbornik/article/view/5318. Acesso em: 19 jun. 2021.