Nelson, Kathleen E. «Observations on an Early Twelfth-Century Antiphoner Fragment at Toledo». Inter-American Music Review 17, no. 1 - 2 (mayo 16, 2019): pp. 17 – 24. Accedido abril 26, 2024. https://iamr.uchile.cl/index.php/IAMR/article/view/53335.