The highly regarded online encyclopedia has articles covering many aspects of history, including supplementary materials and links to outside resources. The article on the history of Europe is broken down into phases and covers all aspects of society. Password is required off campus.
A great database for scholarly articles, JSTOR has a wealth of articles from academic journals, going back to their first issues (but not including the past 3-5 years).
A wealth of 100+ Oxford reference works covering many subjects. Includes a growing number of titles from the acclaimed Oxford Companions Series, plus the Oxford Dictionary of Quotations.