CONCRETE SPIRIT .. (1995). Concrete spirit: The architecture of Ralph Allen. Rockport.
Lua i Stíl Chicago (17ú heag.)CONCRETE SPIRIT .. Concrete Spirit: The Architecture of Ralph Allen. Massachusetts: Rockport, 1995.
Lua MLA (9ú heag.)CONCRETE SPIRIT .. Concrete Spirit: The Architecture of Ralph Allen. Rockport, 1995.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.