You can easily find primary sources by simply searching in the Reeves Library Discovery Search! Follow the tips below to learn more about this process.
You can search for particular formats of primary sources by adding the format you are interested in as a keyword. In the search example below, I was interested in looking for a diary from the Civil War.
After searching pressing search, I was able to find this option:
In the same way we looked for a diary (which has been reprinted into a new book), we can look for primary source articles that are scanned in their original form.
You can type in keywords the same way (with the main subject on one line, and then the wanted format on the next), and then all you need to do is change the Publication Date on the left-hand side. You can see in the example below that I changed the search for newspaper articles about the Great Depression from 1920-1940. 
Here is an example of one of the articles that I found through the search above! They will be available as PDFs, and you can easily download them for your project. Note the date listed on the article! This is one way you can show that this is a primary source.
Audio and visual recordings are great primary sources. Use Films on Demand from Reeves Library to help find videos that aren't free to the public!
Use the search to find historical events, speeches, news broadcasts, and more. In the example below I searched Selma, Montgomery to find film clips of the Civil Rights march in 1965. View the example below, and some of the videos I found in the search:
Here is another example of a primary source video, but this time from the U.S. National Archives collection shared through Youtube.