| title | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) |
|---|---|---|---|
| Exchanges Within: Questions from Everday Life Selected from Gurdjieff Group Meetings With John Pentland in California 1955-1984 | 978-0-8264-1025-2 (0-8264-1025-1) | 1997 | Henry John Sinclair Pentland |
| Exchanges Within: Questions from Everyday Life | 978-1-58542-365-1 (1-58542-365-3) | 2004 | |
Henry John Sinclair Pentland · J. P. · John P. · John Pentland Mahaffy · JOHN PENTLAND MAHAFFY , JOSEPH GRAFTON MILNE , WILLIAM MATTHEW FLINDERS PETRIE