| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| Prentice Hall Prep Series for the Toefl Test: Listening Skills Builder | 978-0-13-187790-0 (0-13-187790-9) | 1994 |
| Prentice Hall Regents Prep Series for the Toefl Test: Four Practice Tests/Book and Audio Cassettes | 978-0-13-187717-7 (0-13-187717-8) | 1994 |