It looks like you're using Internet Explorer 11 or older. This website works best with modern browsers such as the latest versions of Chrome, Firefox, Safari, and Edge. If you continue with this browser, you may see unexpected results.
That's not all though. Don't forget to think about who wrote the articles and who they are written for. Scholarly articles are written by...wait for it...scholars. And by scholars, we mean professors, researchers, and scientists: people who are experts in their fields. So who writes popular articles? For the most part it's journalists, whose expertise is usually writing, not the content area they are writing about.
As for audience, scholarly articles are written for other experts in the field and students in those areas. This means you'll sometimes get words or specialized terms that you may not know. Don't be afraid to look them up. Popular sources are written for everyone, so you get generalized language that might be a bit less specific.
There are some things to consider when determining source credibility. Try using the CRAAP method.*
Currency: Is the information up-to-date? If a web source, do the links work & has it been updated recently?
Relevance: Did you consider many sources before selecting those you'll use?
Authority: Is the author a professor/researcher in communication, psychology, education, business, or a field related to the topic? Does he/she have credentials that qualify them to write about this? Who is the sponsoring organization?
Accuracy: Is the information accurate? Did you compare it with other sources you have located?
Purpose: What is the author's intended goal? Trying to provide research results to other researchers (scholarly)? Trying to sell something (popular)? Trying to summarize research for the general public (popular)? Is the audience the general public or scholars/students?
Remember, popular treatments of topics by scholars are fine to use too!