| title | media type | ISBN-13 | year of publication |
|---|---|---|---|
| Medieval Scotland | Paperback | 978-0-521-58602-3 | 2008 |
| Medieval Scotland | Hardcover | 978-0-521-58443-2 | 2000 |
| The Papacy, Scotland and Northern England, 1342-1378 | Paperback | 978-0-521-89395-4 | 2010 |
| The Papacy, Scotland and Northern England, 1342–1378 | Hardcover | 978-0-521-44182-7 | 1995 |