Clarification, Tom?

Where do you think it comes from?

I have to agree with tomndebb here, although I understand the frustration. If someone makes a claim and can’t or won’t produce a cite, asking over and over and over doesn’t accomplish anything other than derailing the thread. Ask, say, two times and let the failure to produce a cite speak for itself or say “I see you still can’t come up with that cite” and let it go.