Primary sources are materials that provide direct evidence or firsthand testimony concerning the period or subject under investigation. These raw, uninterpreted materials document the events witnessed firsthand that have been recorded by the creator(s) of the materials. Primary sources allow you to make your own interpretations without having to rely on what other scholars have already written on the topic. Remember what is considered a primary sources is subject and research dependent. Make sure to check with a professor for what is considered a primary source in a given field of study.
There are three types of sources:
1) Primary Sources
2) Secondary Sources
3) Tertiary Sources
Adapted from The Craft of Research by Wayne C. Booth, Gregory G. Colomb, Joseph M. Williams. Chicago: University of Chicago Press, c2008.