- Milton's Lycidas: The Tradition and the Poem
- The Cambridge Platonists, (The Stratford-upon-Avon library)
- The grand design of God: The literary form of the Christian view of history, (Ideas and forms in English literature)
- Premises and Motifs in Renaissance Thought and Literature
- Milton's Epic Poetry: Essays on "Paradise Lost" and "Paradise Regained" (Peregrine Books)