Not everything you find will be high quality or appropriate to your topic, especially if you're just searching the web and not the sources recommended in this guide. You need to carefully evaluate your sources before incorporating them into your research. Ask yourself some questions:  

1. Is the article peer reviewed (also called refereed)?
2. Is there an author listed as part of the citation?
3. What is the authority of the author and source? Is the author an expert? Does s/he work for a reputable university or organization? Are there biases in the publication?
4. Judge the relevance to your subject and the discipline. Is the information current? Does your subject require it to be?
5. How old is the source? Will this matter for your topic? Currency of information can be important. Some aspects of a topic may need currency more than others.
6. Does the source have a bibliography? This can lead you to other sources.