Encyclopedia articles can save you time by quickly providing succinct, historical definitions of terms and concepts as well as an overview of a topic, often including references to the major books and articles in a subject area. Try comparing what you have found in Wikipedia with these subject encyclopedias in the library subscription database Gale Virtual Reference Library
Three of the 120 encyclopedias in GVRL are especially relevant to education.
International Encyclopedia of the Social Sciences (2008, 9 vols)
Here are some subject encyclopedias in the print Reference Collection: