Primary sources are the "materials on a topic upon which subsequent interpretations or studies are based, anything from firsthand documents such as poems, diaries, court records, and interviews to research results generated by experiments, surveys, ethnographies, and so on."*
Primary sources are records of events as they are first described, usually by witnesses or by people who were involved in the event. Many primary sources were created at the time of the event, but can also include:
*From Hairston, Maxine and John J. Ruszkiewicz. The Scott, Foresman Handbook for Writers. 4th ed. New York : HarperCollins College Publishers, 1996, pg. 547.