The two most important things to be looking for in a source are the credibility (after all, we all want information that we can trust and nobody will believe in a source that shares wrong information) and relevance (since we all want the source to support a claim in a way that it makes sense and makes the claim more valid).
Attributive. When you’re describing someone, you call their characteristics attributes so the same applies here when you’re using adjectives to describe the quality of a noun.
