| title | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) |
|---|---|---|---|
| Justice and Mercy in "Piers Plowman" | 978-0-7099-2354-1 (0-7099-2354-6) | 1983 | |
| Justice and Mercy in Piers Plowman: A Reading of the B Text Visio | 978-0-367-18465-0 (0-367-18465-6) | 2019 | |
| The Works of the Gawain Poet: Sir Gawain and the Green Knight, Pearl, Cleanness, Patience | 978-0-14-042414-0 (0-14-042414-8) | 2014 | Ad Putter |