A primary source is an original document containing firsthand information about a topic.
Different fields of study may use different types of primary sources.
In the Arts and Humanities, common examples of a primary source are:
In the Sciences, these are common examples of primary sources:
A secondary source contains commentary on or discussion about a primary source. The most important feature of secondary sources is that they offer an interpretation of information gathered from primary sources
Secondary sources in the Arts and Humanities:
Secondary Sources in the Sciences: