| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| The Cambridge Medieval History: Volume 1, The Christian Roman Empire and the Foundation of the Teutonic Kingdoms | 978-0-521-04532-2 (0-521-04532-0) | 1975 |
| The Cambridge Medieval History, Volume 2, The Rise Of The Saracens And The Foundation Of The Western Empire, | 978-0-521-04533-9 (0-521-04533-9) | 1980 |