Identifying a source as scholarly or popular can often be tricky. Here are some things to look out for. Keep in mind, not all of these must be true in order to make a source scholarly or popular, and sometimes the elements overlap in both, but this is a good start to determining credibility.
Newspaper or Magazine articles
Written by expert in the field
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Contains the elements of an academic article (Abstract, Introduction, etc.)
Written by a reporter or journalist
Includes references to other scholarly articles or data sets
Contains cited sources
If you are still unsure if a source is credible (whether scholarly OR popular), remember to:
Google the Author
Has the author written other articles or books?
Does the author have any expertise/a lot of experience in the field?
Google the Publication and look at the "About" page
Does the page indicate if the publication is peer-reviewed?
Does the publication have any major bias as determined by outside sources?