"Use reference books..to get quick specific facts or information or an overview of a subject...Some examples of reference sources are: dictionaries, encyclopedias, bibliographies, almanacs, directories, atlases, and handbooks. These can be online or in print" ["What are reference books (or reference sources)?", Simon Fraser University Library]. Reference sources can also point to scholarly sources in their list of references or suggested resources for further reading.
After you find background information, you will be better equipped to look for scholarly books and magazine, newspaper, and journal articles.
Specialized academic and encyclopedic material: find academic articles and definitions. Excellent beginning resource. Find the Career Information Center here!