Primary sources are original documents or first hand accounts from a given historical period, as opposed to secondary sources, such as journal articles, which provide information about and analysis of events and primary sources.
Primary sources can take many forms, including: newspaper articles from the time period being studied, diaries, letters, photographs, autobiographies, posters, advertisements, original manuscripts, speeches, poems, oral histories, interviews, laws, transcripts, congressional hearings, pamphlets, and more.
From: Loyola Marymount University library