| title | ISBN-13 | year of publication |
|---|---|---|
| From Pericles to Philip: -1918 | 978-1-112-10738-2 | 2009 |
| Progress in Religion to the Christian Era: -1922 | 978-1-112-15701-1 | 2009 |
| The Conflict of Religions in the Early Roman Empire: -1909 | 978-1-112-16236-7 | 2009 |
| The conflict of religions in the early Roman empire | 978-1-4297-8359-0 | 2009 |
| The Pilgrim: Essays on Religion | 978-1-112-16235-0 | 2009 |