Frankfurter Societäts-Druckerei · HarperCollins
| title | ISBN-13 | year of publication | |
|---|---|---|---|
| Imperial Dream | 978-0-00-211411-0 | 1972 | |
| King of Two Worlds: Philip II of Spain | 978-0-00-211684-8 | 1974 | |
| Northumbria | 978-0-00-211574-2 | 1976 | |
| Philipp II, König zweier Welten | 978-3-7973-0323-3 | 1984 | |
| The Second Man | 978-0-06-080528-9 | 1981 |