Scholarly/Peer Reviewed Journals (JAMA, Science, etc.)
Intended for an audience with knowledge in the field.
Articles are written by scholars, whose names are listed along with credentials.
Articles are footnoted and list sources used.
Usually not for profit
Popular Magazines (Time, People, etc.)
Intended for a general audience.
Authors may not have training in what they are writing about.
No bibliography or references listed.
Finding Scholarly articles
Several Databases (such as Academic Search Complete) give you the option to limit to scholarly/peer reviewed journals:
However, to be completely sure that you are using an article from a peer-reviewed journal, you should still check in the database Ulrichsweb.
Checking in Ulrichsweb
Go to the link to Find Articles & Databases
Now select "U" in the alphabetical list of databases - then scroll down and select Ulrichsweb.com:
Now type in the title of the JOURNAL (not the article title) and select SEARCH:
If the refereed icon is next to your journal title, you can be sure that the journal is a scholarly/peer-reviewed/refereed title.