1-https://en.wikipedia.org/wiki/American_modernism.
3-https://drawpaintacademy.com/tonalism.
7-https://www.britannica.com/art/Social-Realism-painting.
8- https://artsandculture.google.com/entity/regionalism/m0b3791?hl=en.
10-https://www.widewalls.ch/magazine/aaron-douglas-aspects-of-negro-life.
11-https://www.wikiart.org/en/archibald-motley.
12-https://americanart.si.edu/education/oh-freedom/charles-henry-alston.
13- https://americanart.si.edu/exhibitions/african-american-2012.
14- https://www.theartstory.org/movement/harlem-renaissance/artworks.
15- https://artsandculture.google.com/entity/harlem-renaissance/m019y_2?hl=en.
16- http://www.artnet.com/artists.