Books, articles, reviews, magazines... There's so many types of resources, where do I start?
Check out this great infographic from Portland Community College describing various resources and their differing qualities:
Know Your Sources: A Guide to Understanding Sources
This video describes the features of Google Advanced Search, which can help you focus your search results on exactly what you need.
When is the last time you thought about how you enter searches in a tool like Google?
Take a quick look through Google's How to Search on Google article, then go a step further and check out Refine Web Searches.
Making use of advanced search screens can help you hone your search skills!
Google Advanced Yahoo Advanced
Also -- try limiting your search by domain (.edu, .gov, .org, etc.) by typing site:.edu in the box along with your search terms.
Before you use a website -- or any source -- for an assignment, consider:
There are many variations on this technique -- here are links to a few of them.