Bias - When you unfairly favour one side of an argument.
Source - Where you got the information from.
Credible - Factual, truthful, reliable.
Authority - The authority has good/in depth knowledge of the subject.
Reliable - Can trust that this information is correct.
Perspective - Point of view, the way you see it.
Agenda - What you are trying to do, eg convince of a fact.
Manipulate - Mould something into what you want it to be.