| title | ISBN-13 | year of publica- tion | other author(s) |
|---|---|---|---|
| Extensions | 978-0-13-298126-2 | 1987 | Jason A. Mortimer |
| Extensions | 978-0-13-298134-7 | 1987 | |
| Spectrum 1A Workbook | 978-0-13-829912-5 | 1992 | et al |
| Spectrum 4: A Communicative Course in English: Textbook/20139 | 978-0-13-826660-8 | 1982 | Diane Warhawsky · Sandra Costinett |
| Spectrum: a Communicative Course in English: Level 2B Workbook | 978-0-13-830043-2 | 1993 | et al |
| Spectrum: Level 1B Workbook: a Communicative Course in English | 978-0-13-829961-3 | 1992 | " |
| Spectrum: Level 2A Workbook: a Communicative Course in English | 978-0-13-829995-8 | 1993 | " |
| Spectrum Workbook | 978-0-13-830209-2 | 1994 | |
| Write away Book 1 | 978-0-06-041087-2 | 1991 | Gloria Gallin |
| Write Away Book 3: A Course for Writing English | 978-0-06-041089-6 | 1990 | Gloria Gallingane |
D B · D Byrd · Donald B. · Donald R. Byrd · Donald R. H. Byrd