Lua APA (7ú heag.)

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.