Use Oxford Reference Online to find background information on your topic. The database contains electronic versions of top-quality reference titles in an easy-to-use interface.
Encyclopedia's and dictionaries are a great place to start your research. They offer a broad coverage of many topics and can help you clarify your topic. Don't forget to look at the bibliography at the end of encyclopeida articles, the sources listed there can help you find more information on the topic.
Encyclopedia of Educational Psychology
The concise Corsini encyclopedia of psychology and behavioral science
Encyclopedia of Education
Encyclopedia of psychology
Greenwood Dictionary of Education
APA dictionary of psychology by 
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