| title | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) |
|---|---|---|---|
| Activities Manual Answer Key with Lab Audioscript for Tu dir?s!, 4th | 978-1-4130-3164-5 (1-4130-3164-1) | 2006 | John Guti?rrez-Candelaria · Harry L. Rosser |
| Tu diras | 978-1-4130-2810-2 (1-4130-2810-1) | 2006 | John R. Guti?rrez · Harry L. Rosser |