1. Augustine of Hippo, Select Anti-Pelagian Treatises, ed. by William Bright (Oxford: Clarendon Press, 1880)
2. ———, Answer to the Pelagians, trans. by Roland J. Teske (Hyde Park, NY: New City, 1997)
3. Langland, William, Piers Plowman: A Parallel-Text Edition of the A, B, C and Z Versions, ed. by A. V. C. Schmidt, 2nd edn, 2 vols (Kalamazoo, MI: Medieval Institute, 2011)
4. Petri Lombardi, Libri IV Sententiarum, 2nd edn, 2 vols (Florence: Collegii S. Bonaventurae, 1916)
5. Adams, Robert, ‘Langland’s Theology’, in A Companion to ‘Piers Plowman’, ed. by John Alford (Berkeley: University of California Press, 1988), pp. 87–114