Reference sources can be useful in finding introductory information and/or topic overviews, especially when you are just beginning your research. Try also reviewing the bibliography of reference sources.
Provides a single interface for searching more than 20 Oxford encyclopedias and 175 language and subject dictionaries and reference works, including the Oxford Companion series, Oxford Dictionary of Quotations, and Visual English Dictionary. Covers all areas of science, medicine, humanities, social sciences, and business.
This online reference collection provides full-text access in PDF and html formats to more than 200 major reference works published since 2000, including encyclopedias, almanacs, directories, and handbooks by publishers such as Berkshire, Cambridge, Macmillan, Sage, Scribner, Sharpe, St. James, Thomson Gale, and Wiley.