| title | media type | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) |
|---|---|---|---|---|
| Challenging Maths | Paperback | 978-0-07-094378-0 (0-07-094378-8) | 1971 | C.E.L. Farmer · John William Baxter |
| Challenging Maths | Hardcover | 978-0-07-094379-7 (0-07-094379-6) | 1970 | C.E.L. Farmer · J.W. Baxter |