| Clue | Source | Date |
|---|---|---|
| Credit lines? | New York Times | 16 Sep 2023 |
| Acknowledgments | USA Today | 18 Dec 2019 |
| Gestures of gratitude | Universal | 22 Mar 2019 |
| Gestures of gratitude | ||
| Quaint gestures of gratitude | New York Times | 05 Dec 2017 |
| Quaint gestures of gratitude | ||
| Online acknowledgments | Wall Street Journal | 20 Nov 2015 |
| Online acknowledgments |