In the context of your assignment, secondary sources are ones you might consult for background information about your time period or the country you're studying. You might also look at secondary sources to read a scholar's take on a topic. Basically, it's any kind of source that isn't one of your primary source documents. I've listed a number of places that might help you find additional information about your topic.
I recommend starting with resources listed in the "Information about Countries" and "Information about Historical Context." The catalog search box at the very bottom lets you search all of our library books. You might also look for articles in any of the recommended databases.
This list can be overwhelming - and it's not even comprehensive. If you need any help, just let me know!
Reference books are an excellent resource to use during your research. They provide overviews of topics, including countries you may be investigating, as well as statistic, demographic, governmental and any other kind of country data you're looking for. Reference books are shelved on the main floor of the library.