HarperCollins · Sutton Publishing Ltd
| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| The Mystery of the Princes: An Investigation into a Supposed Murder | 978-0-904387-58-2 (0-904387-58-5) | 1981 |
| Thomas Paine: His Life, Work and Times | 978-0-04-923061-3 (0-04-923061-1) | 1973 |
| Wilkes: A Friend to Liberty | 978-0-04-923064-4 (0-04-923064-6) | 1974 |