Siegel, K. (2001). Robert Morris: Katy Siegel looks back at the 1962 studio visit by gallerist Richard Bellamy. Artforum.
Citazione stile Chigago Style (17a edizione)Siegel, Katy. "Robert Morris: Katy Siegel Looks Back at the 1962 Studio Visit by Gallerist Richard Bellamy." Artforum 2001.
Citatione MLA (8a ed.)Siegel, Katy. "Robert Morris: Katy Siegel Looks Back at the 1962 Studio Visit by Gallerist Richard Bellamy." Artforum, 2001.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.