Secondary sources provide analysis about materials. Creators of secondary sources did not experience the event first hand. For example, a diary or a newspaper article you use will provide an account of what happened, where as a journal article will provide an analysis of that moment. The writer of the secondary source may use theories to discuss these first hand accounts.
When searching for secondary sources in scholarly journals, remember to be as broad as possible in your first search and then limit accordingly. For example, if you are going with the Philadelphia Yellow Fever topic, you might find those keywords to be too specific. Instead, try searching Yellow Fever and then use the limiters on the left side to refine your search:
These tips are useful no matter what your topic is.
NOTE: SINCE MANY LIBRARIES ARE CLOSED AND ARE NOT SUPPORTING INTERLIBRARY LOAN SERVICES, CLICK THE LINKED FULL TEXT BOX TO MAKE SURE THAT YOU CAN RETRIEVE THE MATERIALS YOU REQUIRE.