| title | ISBN-13 | year of publica- tion | other author(s) |
|---|---|---|---|
| First Certificate Direct Companion | 978-0-521-00786-3 | 2002 | Mary Spratt · Bob Obee |
| First Certificate Direct Companion Answer Key | 978-0-521-52096-6 | 2002 | Mary Spratt · Bob Obee |
| Objective PET Companion | 978-0-521-60104-7 | 2005 | Barbara Thomas |
| Objective PET Companion Answer Key | 978-0-521-60105-4 | 2005 | " |
G. P. · George Papadopoulas · George Papadopoulos · George Pappadopoulos · Greg Papadopoulos