Lynette Yiadom Boakye exhibition, 2019. Cropped version of image ©acedout on Flickr.
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Summon is usually the best starting point for finding articles, books and dissertations.
You may also want to run supplementary searches in these databases:
A note on terminology: when looking for earlier sources, it can be worth searching with vocabulary that is now considered out-dated, or even offensive. For instance, Afro-American may find older sources not found by a search for African American.
For introductory articles: