@freemo @toxomat @ned you didn't just ask, you snarked a load of snark at the person you 'asked' after the fact, when it is not commonplace to cite things that are in the public consciousness widely already. This is social media, not a journal. They weren't making a claim that people haven't already largely backed up for themselves.
If you're honestly asking because you don't know (and not looking it up yourself for some reason), you don't have to be an ass about it.