Can't find the author's name or credentials? A magazine or newspaper article may be written by an unnamed staff reporter. When there is no author given, the authority of the source is based on the reputation of the publisher or producer of the information. An organization can be considered as the author.
Check the domain of a website. Some are more regulated than others. For example, .gov is always a government website, but it could be federal, state, or local. Universities are usually .edu, but there are exceptions, and the specific webpage might be the work of student. Although .org usually means organization and .com means commercial, anyone can use either of these.
Look beyond the source. How an organization describes itself may be very different from how others see it. Do a separate search for the organization name. What do other credible sources say about it? Wikipedia can be helpful, but better yet, look up the organization in a database like Credo Reference.