| title | media type | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|---|
| The Helpline | Paperback | 978-1-9821-2303-1 (1-9821-2303-6) | 2019 |
| The Helpline: A Novel | " | 978-1-9821-1134-2 (1-9821-1134-8) | 2020 |
| The Helpline: A Novel | Hardcover | 978-1-9821-1133-5 (1-9821-1133-X) | 2019 |