Siegel, K. (2001). Robert Morris: Katy Siegel looks back at the 1962 studio visit by gallerist Richard Bellamy. Artforum.
Chicago-Zitierstil (17. Ausg.)Siegel, Katy. "Robert Morris: Katy Siegel Looks Back at the 1962 Studio Visit by Gallerist Richard Bellamy." Artforum 2001.
MLA-Zitierstil (8. Ausg.)Siegel, Katy. "Robert Morris: Katy Siegel Looks Back at the 1962 Studio Visit by Gallerist Richard Bellamy." Artforum, 2001.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.