1. Auden, W.H. (1989) The Sea and the Mirror: A Commentary on Shakespeare’s The Tempest, in Edward Mendelson (ed.), W. H. Auden: Selected Poems, London and Boston: Faber and Faber.
2. Browning, Robert (1979) “Caliban upon Setebos; or, Natural Theology in the Island”, in James F. Loucks (ed.), Robert Browning’s Poetry, New York: W.W. Norton, 252–9.
3. Keats, John (1979) “To George and Tom Keats, 21, 27 (?) December 1817”, in Robert Gittings (ed.), Letters of John Keats, Oxford: Oxford University Press.
4. McIntosh, Mark A. (1998) Mystical Theology, Oxford: Blackwell.
5. Orgel, Stephen (ed.) (1987) The Tempest, Oxford: Oxford University Press.