(1971). Circle: International survey of constructive art. Praeger Pub.
Lua i Stíl Chicago (17ú heag.)Circle: International Survey of Constructive Art. New York: Praeger Pub, 1971.
Lua MLA (9ú heag.)Circle: International Survey of Constructive Art. Praeger Pub, 1971.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.