Abel, C. (2003). Sky high: Vertical architecture. Royal Academy of Arts.
Lua i Stíl Chicago (17ú heag.)Abel, Chris. Sky High: Vertical Architecture. London: Royal Academy of Arts, 2003.
Lua MLA (8ú heag.)Abel, Chris. Sky High: Vertical Architecture. Royal Academy of Arts, 2003.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.