Kertess, K. (1996). Robert Ryman "Standard", 1967. Artforum.
Lua i Stíl Chicago (17ú heag.)Kertess, Klaus. "Robert Ryman "Standard", 1967." Artforum 1996.
Lua MLA (8ú heag.)Kertess, Klaus. "Robert Ryman "Standard", 1967." Artforum, 1996.
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