Basic tools

General reference sources online

Gale Virtual Reference Library  Excellent collection of full text encyclopedias.

Sage Reference Online  Excellent collection of full text encyclopedias.

Oxford Reference Online  Outstanding collection of encyclopedias, dictionaries, and companions.

Encyclopedia Britannica  Now includes rich supplementary material (maps, data, news, articles, website links and more).

Selected subject encyclopedias

Dictionary of American history. Online; a classic ten-volume encyclopedia. (Print: Olin Library Reference E174 .D52x 2003 +)

The Oxford Companion to United States history. Online edition 2004, in Oxford Reference Online. (Print: Olin Library Reference E174 .O94 2001 +)

SAGE Encyclopedia of Surveillance, Security, and Privacy. Online. (Print: Olin Library Reference Oversize HM846 .S26 2018+)

Background on theories and theorists