| title | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) |
|---|---|---|---|
| Toll-Free Phone Book USA 2015: A Directory of Toll-free Telephone Numbers for Businesses and Organizations Nationwide, Containing Tool-Free Numbers, ... and Institutions, Including Companies, Ass | 978-0-7808-1371-7 (0-7808-1371-5) | 2014 | Inc. Rich's Business Directories |
| Toll-Free Phone Book USA 2016: A Directory of Toll-free Numbers for Businesses and Organizations Nationwide | 978-0-7808-1433-2 (0-7808-1433-9) | 2015 | " |