Scholarly journal articles are written by experts, like professors, scientists, or practicing psychologists. They are also written for experts or students, so they are written at a higher level than popular sources, like newspapers and magazines. Scholarly journals use a process call peer review, which means that other experts read and review each article before it is published.
Beware: Scholarly journals can contain non-scholarly articles!
For example, many scholarly journals publish book reviews and letters to the editor. These are not peer-reviewed, but they will show up in database search results even if you check the option to receive only results from scholarly/academic journals.
Luckily, you can spot these articles easily. They don't cite their sources formally, they don't have formal sections, and they are often very short. Many databases also label these types of articles to make it easier for you.
Although scholarly journals tend to be more credible than other forms of information (because of the peer review process), that doesn't mean that they are above reproach. There is still a lot of bad science out there! So how do you spot it? The 12 flags below are signs that you may be looking at bad science.
Source: Knigel Holmes on Nodes of Science