In addition to consulting more specialized databases (see bottom right box on this page), you can use the Catalog and Articles+ search functions in CLIO to locate potential primary sources for your research.
Using the CLIO Catalog search:
Using the CLIO Articles+ Search:
The "primaryness" of a source emerges in relation to the researcher's engagement with it. The UC Berkeley Libraries define primary sources as "either created during the time period being studied or...created at a later date by a participant in the events being studied (as in the case of memoirs)."
(source: Finding Historical Primary Sources: Getting Started, last updated 8/12/18, http://guides.lib.berkeley.edu/c.php?g=4409&p=15606)
When determining primary sources for your research, it's helpful to give yourself a historical context that defines your search. This could be a range of dates. It could also be determined by geographical sites of origin. You might also be interested in a specific type of source. Some examples include:
"Kweli means 'Truth' in Swahili. kweliTV celebrates global Black stories and amplifies Black storytellers from North America, Africa, Latin America, the Caribbean, Europe, Asia and Australia. Our mission is to curate and create content that is a true reflection of the global Black experience that’s oftentimes missing in traditional media."