| title | media type | ISBN-13 | year of publica- tion | other author(s) |
|---|---|---|---|---|
| Answer's Here: Bk. 1 | Hardcover | 978-0-7175-0185-4 | ||
| Answer's Here: Bk. 2 | " | 978-0-7175-0186-1 | ||
| Answer's Here: Bk. 3 | " | 978-0-7175-0187-8 | ||
| Forty Comprehension Exercises in English | Paperback | 978-0-7175-0188-5 | 1987 | |
| Forty Comprehension Exercises in English: w. ans | " | 978-0-7175-0189-2 | 2000 | |
| Forty Lessons and Exercises in Grammar and Language | Hardcover | 978-0-7175-0190-8 | 1987 | J.D. Bentley |
| Forty Lessons and Exercises in Grammar and Language | Paperback | 978-0-7175-1175-4 | 1983 | |
| Forty Lessons and Exercises in Grammar and Language: Ans | " | 978-0-7175-1292-8 | 1984 | J.D. Bentley |
| Forty Lessons and Exercises in Grammar and Language: Ans | " | 978-0-7175-1176-1 | 1983 | |
| Forty Lessons and Exercises in Grammar and Language: w. ans | " | 978-0-7175-0191-5 | ||
| Forty One-word English Tests | " | 978-0-7175-0192-2 | ||
| Forty One-word English Tests: w. ans | " | 978-0-7175-0193-9 | ||