HarperCollins · Palgrave Macmillan
| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| W.B.Yeats and W.T.Horton: Record of an Occult Friendship | 978-0-333-27165-0 (0-333-27165-3) | 1980 |
| Yeats's Golden Dawn | 978-0-06-492718-5 (0-06-492718-0) | 1974 |
G.M. · George Harper · George M. · George M. Harper · George Mills · M. H. · M Harper