Personally, I think Tony leaves out the source because of his childhood trauma. When he was a kid, he asked his dad if he wanted some sauce on his bagel. His dad told him he would amount to nothing, and never have his own TV show. Because of the meme correlation between sauce and the word 'source', Tony declines to source his links on the internet to avoid triggering a PTSD response.
I have multiple degrees in online forum behavior, social networking, and Tonyology. And wasting time on the internet making handicapped accusations with no logical basis.