SNOJ, Jurij. The Ljubljana Handwritten Copy of Tractates by Guido of Arezzo. Musicological Annual, Ljubljana, SI, v. 28, n. 1, p. 63–71, 1992. DOI: 10.4312/mz.28.1.63-71. Disponível em: https://journals.uni-lj.si/MuzikoloskiZbornik/article/view/5318. Acesso em: 14 jan. 2025.