Smithson, R., & Hobbs, R. C. (1983). Robert Smithson: Retrospective (view) / Robert Hobbs.
Lua i Stíl Chicago (17ú heag.)Smithson, Robert, agus Robert Carleton Hobbs. Robert Smithson: Retrospective (view) / Robert Hobbs. 1983.
Lua MLA (8ú heag.)Smithson, Robert, agus Robert Carleton Hobbs. Robert Smithson: Retrospective (view) / Robert Hobbs. 1983.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.