CLASP Handlist Book: Hartzell, Karl D., ed., Catalogue of Manuscripts Written or Owned in England up to 1200 Containing Music (Woodbridge, Suffolk: Boydell Press, 2006), no. 146 Manuscript references in: London, British Library, Cotton Vespasian D. xii London, British Library, Cotton Vespasian D. XII London, British Library, Cotton Vespasian D. xii