Not all sources are suitable for a university level assignment. Some may not be scholarly enough, others may be downright dodgy.
You need to evaluate your sources to make sure they aren't crappy.
Go to the InfoSkills Road Trip module on Evaluating Resources to learn how to recognise credible sources and week out the sources you really shouldn't be using in your assignment.
Check out the InfoSkills Toolkit for more information
The CRAAP test is a quick mnemonic to remind you what you should look for when evaluating sources:
How old is it? Is there a chance it is no longer up to date? Could you find something newer?
Is it actually on-topic? It may mention the thing you are researching, but is it actually about that topic? Could you find something more relevant?
Who wrote it? Why should you trust them to know what they are talking about? Are they respected experts in their field? Does it make sense for them to write about this?
Does everything they say add up (e.g. does their discussion make sense given what they said in their results)? Can you see where they got their information from (do they have good references)? Have they made any obvious mistakes (e.g., if it's a web page, is if full of broken links)? From the other things you've read on this topic, does it sound like they may have missed something important? Can you detect evidence of bias?
What *is* the source you are looking at? Is it the kind of source you should be using? For example, if you were asked to use peer reviewed journal articles, a news report would not be fit for purpose.
It's important to note that academic journals, in addition to articles, also publish editorials, book reviews, film reviews, letters, columns, and other marginalia that are . Make sure you look for some other clues before deciding that you're looking at a scholarly article.
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