No matter what citation style you use, sometimes professors will ask you to use "scholarly articles" rather than popular magazines. What's the difference? See the table below:
Characteristics
Scholarly Articles
Popular Magazine
Appearance
Sober and serious May contain graphs or charts Will not find glossy pages or photographs
Attractive appearance Advertisements Heavily illustrated Glossy paper
Audience
Scholars and students
General audience
Authors
Scholars in the field of study
Reporters, usually not experts on the subject
Documentation
Sources cited in footnotes and/or bibliography
Sources not cited or cited informally
Purpose
Report results of original research or experimentation
Provide general information
Article Acceptance Procedure
Many (but not all*) scholarly journals are "refereed" or "peer review" journals - articles undergo a rigorous examination by other scholars in the field before being published.
Written by hired reporters, edited by magazine editors, and published.
Example journals
Medicine & Science in Sports & Exercise Journal of Sports Medicine Internal Journal of Sport Psychology
Sports Illustrated Coach and Athletic Director Bicycling
Still not sure if your source is peer-reviewed or not? Try Ulrich's Periodical Directory -- it lists each periodical as Consumer, Trade, or Academic/Scholarly.
Evaluating Sources
Also no matter what citation style you use, you still need to use critical thinking skills to evalute the source. This is especially true with online-only sources or non-academic journals. Check the following:
Authorship:
Is the person, group or organization responsible for the site identified?
What type of site have you located? For example, is it a personal page (.net) or blog, a company website (.com), an organization (.org) or an educational institution (.edu)?
Accuracy:
Does the author cite reliable sources for his or her facts?
How does the information compare with that in other works written about this topic?
Authority:
What are the author's qualifications for writing on this subject?
Is he or she connected with an organization that has an established reputation?
Currency:
Does the web site include a publication date or "last updated" date?
Objectivity:
Is the author affiliated with a particular organization that might have a bias?
What does the URL mean?
If you're not sure of the source of content on the Web, take a look at the top-level domain (part of the URL) to get an idea. Here are a few domains you might find:
.com = commercial, for-profit sites
.edu = educational institutions
.gov = government agencies
.org = nonprofit organizations
.pro = doctors, lawyers, accountants
.biz = businesses
.mil = military
.net = Internet service providers, which are companies that provide access to the Web; personal websites often have this top-level domain
.name = personal websites
.info = general top-level domains for individual sites, business, or organizations