La Trobe University - Library: Medieval Music Database - Annual cycle of feasts of liturgical chant, liturgical polyphony and secular music of the late middle ages.

Medieval Music Database - Browse By Manuscript

Manuscripts containing works by Pennard

London, British Library, Additional 40011B (Fountains fragments)
London, British Library, Additional 57950 (olim Old Hall, Library of St. Edmund's College)
Princeton, University Library, Medieval and Renaissance Manuscripts 103