Quite often you will be expected to use "scholarly" or "peer-reviewed" sources. How can you tell whether a source is scholarly? Look for these indicators.
Though many databases let you limit a search to scholarly articles, they aren't foolproof. As an example, they will include book reviews, which are not reporting original research and may not be what your course instructor has in mind. When in doubt, check with your professor. And take a look at "Anatomy of a Scholarly Article" from North Carolina State University Library.
One of the most powerful ways to find valuable sources and assess their significance is to follow the breadcrumb trail left by scholars in their published work. When researchers cite sources, they are bolstering their argument by providing evidence, but also pointing readers to places they can go for more information. Take them up on it!
In addition to references in books and articles, the bibliographies found in specialized reference works will point you to the most significant research on a topic, an efficient shortcut to the best stuff.
Once you see a reference that looks good, how do you get your hands on it? Here's a quick checklist.
The term "primary source" is defined differently by different disciplines. In the humanities, a primary source is a historical document, such as a diary, memoir, a work of art, a news account published when an event was fresh - something from the historical period under examination, unfiltered by anyone else. In the sciences, a primary source is a scientist's write-up of their research that includes their methods and results, as opposed to science journalism or a summary of research (a "review article") that has been conducted to provide an overview of research on a given topic.
A secondary source is one that has already been analyzed by someone else.Moving even further from the unfiltered event is a teriary source such as a textbook, that summarizes knowledge in general terms.
Using primary sources, whether in science or the humanities, helps a researcher get as close as possible to the subject under examination. Using primary sources can be a good way to point your reader to the raw materials of your ideas and provide an opportunity for you to do your own, original analysis.
As you search, keep track of the most promising sources and then look at them closely, asking yourself these questions.
When you aren't an expert, it may seem daunting to evaluate the work others have published, but a book's table of contents or an article's opening paragraphs will help establish relevance. The language it is written in will help you decide if it is scholarly enough and yet not too highly technical for your purposes. Information given about the author might help you decide how much an authority he or she is. For Web sources, follow links to information "about this site" or to an author's home page, or shorten the URL to everything up to the first slash to see what its parent page looks like. When in doubt, check with your instructor.
Compare: In addition to looking at the quality of individual sources, compare them so that you can see where there are differences and conflicts. Even if you are heading toward a particular conclusion, you want to discuss alternative perspectives so your reader gets the big picture.
Corroborate: If you feel as if you're going out on a limb, try to corroborate the information you want to use in another source. A reference librarian can help you do that.