| title | media type | ISBN-13 | year of publication |
|---|---|---|---|
| Couples and Change | Paperback | 978-1-138-81501-8 | 2016 |
| Couples and Change | Hardcover | 978-1-138-81494-3 | 2014 |
| Coupling... What Makes Permanence? | Paperback | 978-1-138-81540-7 | 2016 |
| Coupling... What Makes Permanence? | Hardcover | 978-1-138-81418-9 | 2014 |