These websites are an excellent source of bibliography for both primary and secondary literature.
Oxford Handbooks Online
Oxford history of modern EuropeA series of volumes on specific countries or topics. Search the Main Catalog for "Oxford history of modern Europe" to find them all. Some are available online, others only in print.
New Cambridge modern historyGeneral and Humanities Reference (DR) D208 .N4
Blackwell Companions to European History:A Companion to Eighteenth-Century Europe A Companion to Nineteenth-Century Europe A Companion to Europe 1900-1945
Encyclopedia of Eastern Europe : from the Congress of Vienna to the fall of communism. Edited by Richard Frucht. New York : Garland Pub., 2000.
Firestone Library: Non Circulating (Fnc). DJK6 .E53 2000