Best database for world history. Lists scholarly articles from history journals. Allows you to search by journal name. Each article is summarized. Covers the history of civilization (excluding the United States and Canada) from 1450 to the present.
America: History and Life is the definitive index of literature covering the history and culture of the United States and Canada from prehistory to the present
WorldCat includes records for books, videos, serial publications, articles, recorded books and music, electronic books, sheet music, genealogical references, cultural artifacts, digital objects, Web sites and much more. Contents from Milne Library and other libraries worldwide in over 470 languages.
Google Book SearchThis search tool can pull up some full text books, butt many of the results will just have excerpts and snippets.