Sources:
- conceptualism – https://www.metmuseum.org/toah/hd/cncp/hd_cncp.htm
- https://www.tate.org.uk/art/art-terms/c/conceptual-art
- https://fstoppers.com/portraits/15-outstanding-examples-conceptual-photography-5126
- John Baldessari – http://www.baldessari.org/
- https://www.theartstory.org/artist-baldessari-john-artworks.htm
- Marcel Duchamp – https://www.tate.org.uk/art/artists/marcel-duchamp-1036