Sekuler, R. (1994). Perception Robert Sekuler, Randolph Blake. McGraw-Hill.
Lua i Stíl Chicago (17ú heag.)Sekuler, Robert. Perception Robert Sekuler, Randolph Blake. McGraw-Hill, 1994.
Lua MLA (8ú heag.)Sekuler, Robert. Perception Robert Sekuler, Randolph Blake. McGraw-Hill, 1994.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.