| title | ISBN-13 | year of publica- tion | other author(s) |
|---|---|---|---|
| Business | 978-0-02-973770-5 | 1984 | Hugh Wales |
| Spectrum 1: A Communicative Course in English | 978-0-13-826694-3 | 1982 | David P. Rein |
| Spectrum: A Communicative Course in English | 978-0-13-829946-0 | 1993 | David P. Rein · Donald R. H. Byrd |
| Spectrum: A Communicative Course in English Level 6 | 978-0-13-830258-0 | 1994 | Diane Warshawsky · Byrd · David P Rein · Nancy Frankfort · Joan Dye · Sandra Costinett |
| Spectrum: A Communicative Course in English-Level Four | 978-0-13-830811-7 | 1999 | Diane Warshawsky · David P Rein · Nancy Frankfort · Joan Dye · Sandra Costinett |
| Spectrum: A Communicative Course in English-Level Three | 978-0-13-830548-2 | 1999 | Diane Warshawsky · David P Rein · Nancy Frankfort · Joan Dye · Sandra Costinett |
| Spectrum: A Communicative Course in English-Level Two | 978-0-13-832882-5 | 1994 | Diane Warshawsky · David P Rein · Nancy Frankfort · Joan Dye · Sandra Costinett |
| Spectrum, Level 6: A Communicative Course in English | 978-0-13-830266-5 | 1999 | Diane Warshawsky · David P Rein · Nancy Frankfort · Joan Dye · Sandra Costinett |