But, at University, you must learn how to use the right databases which will give you much better focussed search results.
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1. Look at the reference list at the end of journal articles and book chapters to find other useful references. Then try and find relevant ones to use in your piece of work. If you're lucky (and looking at the articles/books online) some may have a hypertext link which might open other articles for you.
2. In many databases, you get the option cited by. This means that you can follow a particular cited reference to more current articles which have also cited that research. The higher the number of cited by sometimes indicates the quality of the research too.
3. Another option is related reading. Have a look at the related reading suggestions that sometimes appears on search pages. These might give you other papers or ideas for your assignments.
This video by North Carolina State University Library describes the peer-review process.
You can find more information about the peer review process in the following document