Richards, C. R. (1929). Art in industry. Macmillan.
Lua i Stíl Chicago (17ú heag.)Richards, Charles R. Art in Industry. New York: Macmillan, 1929.
Lua MLA (8ú heag.)Richards, Charles R. Art in Industry. Macmillan, 1929.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.