| Clue | Source | Date |
|---|---|---|
| HarperCollins or Simon and Schuster | Premier Sunday | 17 Jan 2021 |
| Employs ghostwriter perhaps responsible for a number of tomes | Irish Times Crosaire | 22 Feb 2020 |
| Employs ghostwriter for one of those with a number of titles | Irish Times Crosaire | 12 Aug 2017 |