You can find primary sources in most history databases, more than likely inside secondary sources. The two Gale databases below simply have a section for "primary sources" which allow you to discover them quickly (depending on the topic). All of our History databases can lead you to primary sources, however. What matters most is thinking about the reasons why you need a particular primary source, and the best keywords that will retrieve such results.
In-depth coverage of the most studied topics in United States history.
In-depth coverage of the most studied topics in world history.
Try this interactive tutorial from the CSUN Library
http://library.csun.edu/ovcapt/PrimarySource/index.html