| Clue | Source | Date |
|---|---|---|
| *Social status hierarchy | LA Times Daily | 25 May 2021 |
| *Social status hierarchy | The Washington Post | 25 May 2021 |
| Social stratification | USA Today | 28 Nov 2019 |
| Social hierarchy | LA Times Daily | 25 Jun 2019 |
| Social hierarchy | The Washington Post | 25 Jun 2019 |
| Social hierarchy |