For articles, I think a good measure of credibility is the authors overall tone. It’s not necessarily the length or even the publisher, it’s more based on the context of the paper. If the author uses sufficient research to back up their claim and while doing so they manage to appeal to the egos, logos, and pathos of their argument, then their article should be creditable. In cases where an article does not have these qualities, one could still use this article to decided what would not be effective. Also, just because the article overall seems to not be creditable, that doesn’t mean that the whole thing should be disregarded. Creditable articles should posses an effective egos, logos, and pathos claim, while seeming unbiased and using reliable sources to back up the argument. The easiest way for an article to become non creditable is when the author expresses bias, and lacks a fully developed argument. Using non scholarly sources for information in also another easy way for the author to seem unreliable to the reader.
Overall, if the author uses a convincing tone, unbiased opinion, reliable sources, and an argument that balances between the logic and emotion of the reader, their article should be nothing other than creditable.
