TWOMBLY, R. (1979). Frank Lloyd Wright. John Wiley & Sons.
Lua i Stíl Chicago (17ú heag.)TWOMBLY, Robert. Frank Lloyd Wright. John Wiley & Sons, 1979.
Lua MLA (8ú heag.)TWOMBLY, Robert. Frank Lloyd Wright. John Wiley & Sons, 1979.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.