According to the American Library Association, primary sources are the evidence of history, original records or objects created by participants or observers at the time historical events occurred or even well after events, as in memoirs and oral histories. Primary sources may include but are not limited to: letters, manuscripts, diaries, journals, newspapers, maps, speeches, interviews, documents produced by government agencies, photographs, audio or video recordings, born-digital items (e.g. emails), research data, and objects or artifacts (such as works of art or ancient roads, buildings, tools, and weapons).
*http://www.ala.org/rusa/sections/history/resources/pubs/usingprimarysources
The databases contain thousands of primary sources. Search for your topic and use the tools within each database to limit your results. The following databases are excellent resources for finding primary sources. BE SURE TO LIMIT YOUR SEARCH TO PRIMARY SOURCE DOCUMENTS.
Many university and government websites have collections containing primary sources. Try locating these by creating an advanced search and limit the domain suffix to .edu or .gov, or use the search operator site:gov, site:edu
Use the keywords "pimary source" plus your unique search term (ex. Roosevelt primary source) to find books in the media center that contain primary source documents.