| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| Elie Cartan- Albert Einstein: Letters on Absolute Parallelism, 1929-1932 | 978-0-691-08229-5 (0-691-08229-4) | 1979 |
| Elie Cartan and Albert Einstein: Letters on Absolute Parallelism, 1929-1932 | 978-0-691-60804-4 (0-691-60804-0) | 2015 |