Secondary sources add a layer of interpretation and analysis to primary sources, and are usually written after the time period being examined. Secondary sources can be:
Primary sources are original sources of information, typically created at the time of the events or individuals being researched.
Below are a number of databases containing secondary sources, organised by resource type.
Humanities International Complete (EBSCOhost)
International Medieval Bibliography (IMB)
Taylor Francis Online
Bridget Williams Books New Zealand History Collection
Digital Theatre Plus
eTV
Kanopy