Peer-Reviewed journals give the highest quality information while magazines and newspapers offer lesser quality articles. Below are descriptions of each type of publication and the information contained in them.
Journals are scholarly, reliable information. You still need to evaluate the information, even the best experts make mistakes.
Reay, Mike. 2010. "Knowledge Distribution, Embodiment, and Insulation." Sociological Theory 28(1):91-107. doi: 10.2307/25746215. (all the examples below come from this article)
Peer reviewed journals are a special class - they are the creme de la creme of information sources.
What does peer review mean?
Articles submitted to a journal.
The journal send the articles out to 1 to 3 experts in the field without identifying the author.
The experts review the article and send it back to the journal with recommendations for improvements or approval.
The article is sent back to the author with the recommendations and a tentative approval or rejection of the article. The reviewers remain anonymous.
If improvements are made and there was a tentative approval, the article is resubmitted and published.
In other words, the information is vetted by experts before it is even published.
Most databases allow you to limit your results by peer-reviewed journals.
Keller, A. G. 1916. "Sociology and Science." Nation 102(2653):475-78. (all examples below come from this article)