Google Scholar is a search engine for scholarly material such as peer-reviewed papers, theses, pre-prints, abstracts, and technical reports. Google Scholar indexes material that is freely available and also restricted material where the publisher have given their permission. That means that you can find pointers to relevant material even if the article or book is not freely available. If you come across something that you find useful, explore the links to related material, such as articles that refer to the one you have found.
Please note that Google Scholar may not find all relevant material that exists since it has to restrict its index to what publishers make available to them. If a publisher does not agree to their material being indexed, you will not find it using Google Scholar.
You can see automatically what is available to you via the University Library if you are using a computer on the university network or if you have activated your Library Links (read more here: http://scholar.google.com/intl/en/scholar/librarylinks.html )
You can download references in a choice of bibliographic formats (check your Google Scholar preferences).
It is time well spent to explore the various features of Google Scholar, such as how to make advanced searches: http://scholar.google.co.uk/intl/en/scholar/refinesearch.html.