Horvitz, R. J. (1973). Nature As Artifact: Alan Sonfist / von Robert Joseph Horvitz. Artforum.
Cita Chicago Style (17a ed.)Horvitz, Robert Joseph. "Nature As Artifact: Alan Sonfist / Von Robert Joseph Horvitz." Artforum 1973.
Cita MLA (8a ed.)Horvitz, Robert Joseph. "Nature As Artifact: Alan Sonfist / Von Robert Joseph Horvitz." Artforum, 1973.
Precaución: Estas citas no son 100% exactas.