Wimer, A., & Hobbs, R. (1980). Robert Smithson: Sculpture. Herbert F. Johnson Museum of Art.
Lua i Stíl Chicago (17ú heag.)Wimer, Ann, agus Robert Hobbs. Robert Smithson: Sculpture. New York: Herbert F. Johnson Museum of Art, 1980.
Lua MLA (8ú heag.)Wimer, Ann, agus Robert Hobbs. Robert Smithson: Sculpture. Herbert F. Johnson Museum of Art, 1980.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.