CREDO reference:
Search hundreds of encyclopedias, dictionaries and other reference sources simultaneously.

Gale Virtual Reference Library
Online encyclopedias of business, education, history, medicine, religion and social science. Contains the Encyclopedia of Sociology and several other reference materials relevant to various fields of sociological interest.

Oxford Reference Online
Contains over 100 dictionary, language reference, and subject reference works published by Oxford University Press. All fully indexed and cross-searchable. Contains A Dictionary of Sociology.

Digest of Education Statistics
Annual publication from the Department of Education. The Digest provides a compilation of statistical information covering the broad field of education from prekindergarten through graduate school.