First and secondary sources
When you do your information search, you have to use both first- and second-hand sources.
The first-hand sources are the original sources. The second-hand sources describe, interpret, or analyze the first-hand sources
When you do your information search, you have to use both first- and second-hand sources.
The first-hand sources are the original sources. The second-hand sources describe, interpret, or analyze the first-hand sources