Meet with one of the Davidson research librarians to answer your research questions.
A good place to look for additional sources is in the bibliographies/works cited of an article or book. These sources tend to authoritative and relevant because another scholar incorporated them into his/her work.
Additionally, you may want to investigate who has cited a relevant source. Google Scholar's Cited By feature, enables you to see which sources have cited a source:
Each database has unique terms it uses to classify the sources it contains. The classifications are called Subject Terms
Subject terms can be a useful way to navigate a database and to develop new search terms. For instance, a search for "network analysis" in MLA International Bibliography brings up this article:
Because MLA International Bibliography uses the term "network theory" to describe this article, I would likely find related articles in the database by searching for "network theory"