| title | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) |
|---|---|---|---|
| Direct French Conversation: Bk. 1 | 978-0-13-214735-4 (0-13-214735-1) | 1987 | Daniel de Guzmán · Charles Starr (Dr.) |
| Direct French Conversation, Book 1 | 978-0-13-214743-9 (0-13-214743-2) | 1966 | Daniel de Guzmán · Charles Starr |