| year of publication | ISBN | author(s) | title |
|---|---|---|---|
| 1999 | 978-0-9666733-0-2 | Mary Long | The Complete Guide To Conducting Seminars At Sea |
| 2003 | 978-0-9666733-1-9 | Mary Long Harvey | Travel Wise, Travel Safe: From One Who's Been There and Back |
| 2000 | 978-0-9666733-8-8 | Mary Long | Mary Long's Complete Directory To Cruise Lines International |