| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| A Guide to Correct Welsh | 978-0-85088-441-8 (0-85088-441-1) | 1976 |
| The Thinker's Toolkit: 14 Powerful Techniques for Problem Solving | 978-0-8129-2808-2 (0-8129-2808-3) | 1998 |
D. J. · D. Jones · M. D. · M J · M. Jones · Morgan Jones