ProQuest Central is a great database to begin research on any subject - from Biology to World History.
Credo Reference is a great place to start your research on any subject. All the information from this resource comes from e-books, so if you need a book source for your assignment you're in the right spot.
Ebsco Academic eBook Collection
Ebsco Academic eBook Collection is an extensive database of eBooks covering all subject areas. If you need a book as a source, this is a good place to begin looking.
This brief tutorial will walk you through using Google Scholar. Google Scholar is an extension of Google, but all the information found comes solely from scholarly resources, such as articles, theses, books, abstracts and court opinions.