| title | media type | ISBN-13 | year of publication |
|---|---|---|---|
| 20 Letters to a Friend | Gebunden | 978-0-09-085310-6 | 1967 |
| Only One Year | Paperback | 978-0-06-090193-6 | 1970 |
| Only One Year | Hardcover | 978-0-06-010102-2 | 1969 |
| Only One Year | " | 978-0-09-102100-9 | 1969 |
| Only One Year: A Memoir | Paperback | 978-0-06-244262-8 | 2017 |
| Twenty Letters To A Friend | Hardcover | 978-0-06-010099-5 | 1967 |
| Twenty Letters to a Friend: A Memoir | Paperback | 978-0-06-244260-4 | 2016 |