Europe since 1945: an encyclopedia (print book).
Encyclopedia of diasporas: immigrant and refugee cultures around the world (print book).
Encyclopedia of race, ethnicity, and society (Ebook).
The YIVO encyclopedia of Jews in Eastern Europe: A definitive work about the civilization of Eastern European Jewry; includes primary source materials such as documents, images, audio and video, as well as maps. A print edition is available here.
Holocaust Survivors: a Biographical Dictionary. Emily Taitz. Westport, Conn.: Greenwood Press, 2007 (print book).
Encyclopaedia Judaica: Second and latest edition (2007). This electronic edition is part of the Gale Virtual Reference Library, which enables searching across additional reference works. A print copy of the first edition (1972) is available here.