What source/faction would gather and have impartial information concerning on the topic you are talking about? Who are the experts of that field?

One thing is what the source is saying. Does he sound convincing? Where did he get the information from and how? Your arguments are just as convincing as the sources they come from. If multiple sources say the same, it's more convincing. The credibility of the information is the one of the source. As for citations, just refer to the sources you got the information from. If you don't remember where, try to think of some impartial faction that would know about it and is interested enough about it to provide information.