A primary source is a document or physical object which was written or created during the time under study. These sources were present during an experience or time period and offer an inside view of a particular event. Some types of primary sources include:
Primary sources can include charters, correspondence, diaries, early works, interviews, manuscripts, oratory, pamphlets, personal narratives, speeches, letters, and documents.
Source: Princeton University http://www.princeton.edu/~refdesk/primary2.html