Google News: specifying news outlets/sources in search?

I’m trying to look up a specific topic using Google News but I’d like to restrict the sources I receive results from. Following the advanced news search link on the site, I see a field where I can enter in specific sources, but I can only get results if I specify one source at a time, e.g., New York Times or The Associated Press but not both. I managed to do this a couple years ago with two dozen sources…anyone know how I could do this now?

Point 4.2 may help you.

Hopefully that will work with the **source **argument in News.