| web | https://www.politico.com/story/2019/09/17/epa-california-obama-waiver-1500336 |
| author | Alex Guill़n |
| publication | Politico |
| date | 2019-09-18 |
| web | Vincent Wood | The Independent | 2019-11-03 |
| web | Dino Grandoni, Juliet Eilperin | Washington Post | 2019-09-20 | |
| web | Tiffany Hsu | New York Times | 2019-10-29 |
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