| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| A.S.K. Hollis 2003: The Directory of UK Associations | 978-0-900967-73-3 (0-900967-73-0) | 2002 |
| Hollis Europe 1993-94: Directory of European Public Relations and PR Networks | 978-0-900967-12-2 (0-900967-12-9) | 1993 |