1. University of Pennsylvania, Misc Mss (Large) Box 1 Folder 13 Title: In Evangelium Iohannis tractatus Author: Richard Burdet Date: 1478.
2. University of Pennsylvania, Misc Mss (Large) Box 1 Folder 18 Title: In Evangelium Iohannis tractatus Author: Catholic Church Date: [between 1450 and 1499].
3. University of Pennsylvania, Misc Mss (Large) Box 1 Folder 16 Title: In Evangelium Iohannis tractatus Author: Catholic Church Date: between 1275 and 1299.
4. University of Pennsylvania, Misc Mss (Large) Box 2 Folder 4 Title: In Evangelium Iohannis tractatus Author: Gregory XI Date: 1377.
5. University of Pennsylvania, Misc Mss (Large) Box 2 Folder 18 Title: In Evangelium Iohannis tractatus Author: Christianus Joannes de Villabalzana Date: 1490.