Beyond your literature review, you will need to use sources from other databases and the web to discuss your case studies, explore hypotheses, and detail your dependent and independent variables. Start in these websites, databases, and collections, then use domain limiting in Google to find additional sources.
Use these good search habits to find high quality, authoritative sources on the internet:
1) Limit your Google Search by domain -- add site:. before a domain, such as .gov or .edu.
2) Use Google Scholar, instead of the regular Google search box to find for scholarly articles
3) Let the Google Scholar citation help you find related articles, create a citation or get the full text from the library