1. Joseph Hall, The Great Mystery of Godliness… Also, the Invisible World (London, 1652), 55–56.
2. See David Keck, Angels and Angelology in the Middle Ages (New York and Oxford, 1998)
3. the extracts from various writers in Steven Chase, ed., Angelic Spirituality:Medieval Perspectives on the Ways of Angels (New York, 2002)
4. For a brief overview of the medieval background, see Peter Marshall and Alexandra Walsham, ‘Migrations of Angels in the Early Modern World’, in idem, eds, Angels in the Early Modern World (Cambridge, 2006), 1–40 at 3–13.
5. Jacobus de Voragine, The Golden Legend: Readings on the Saints, trans. William Granger Ryan, 2 vols (Princeton, 1993), 2: 201–11