One challenge is that you cannot always tell by looking at the periodical's cover or the article itself to know whether it is a journal or a magazine. (Newspapers are easy to identify as newspapers however!)
Another challenge is that not all journals have the word “Journal” in their titles. For example, Ladies Home Journal is a magazine despite having the word “Journal” in its title. Science is a journal despite not having "Journal" in the title.
Fortunately, there is a tool that can help with that determination: UlrichsWeb.
UlrichsWeb is an online database that contains the detailed information of over 300,000 periodicals. A key feature is to inform you whether the periodical is a magazine, a newspaper, or an academic/scholarly journal. And then whether the academic/scholarly journal is peer-reviewed.
UlrichsWeb uses “refereed” instead of “peer-reviewed”.
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