Best Choices:
Credo Reference
Reference library of encyclopedias, dictionaries, thesauri, and books of quotations.
Gale Ebooks (formerly Gale Virtual Reference Library)
Variety of reference books covering arts, biography, business, education, environment, general reference, history, information & publishing, law, library science, literature, medicine, multicultural studies, nation & world, religion, science, social science, and technology.
Opposing Viewpoints in Context (formerly Opposing Viewpoints in Context)
Source for information on today’s most controversial and talked about social issues; features viewpoint articles, topic overviews, statistics, primary documents, websites, and magazine & newspaper articles. See the video tutorial.
Also Try:
Weekly reports on issues in the news. Reference entries across Oxford’s dictionaries, companions, and encyclopedias. Brief introductions on a variety of subjects.CQ Researcher
Oxford Reference Online
Very Short Introductions