| Clue | Source | Date |
|---|---|---|
| . . . in a source metaphor | Newsday | 14 Mar 2024 |
| Reliable source | Newsday | 23 Jun 2020 |
| Authoritative source, in a saying | USA Today | 03 Aug 2017 |
| Authoritative source, in a saying | ||
| Authoritative source | The Washington Post | 26 Jan 2016 |
| Information source, supposedly | ||
| Voice of authority | ||
| Whence tips come to a D.V.M.? | ||
| Supposedly reliable source of info |