Levy, H., & Spalding, H. (1952). Literature for an age of science. Methuen.
Lua i Stíl Chicago (17ú heag.)Levy, Hyman, agus Helen Spalding. Literature for an Age of Science. London: Methuen, 1952.
Lua MLA (8ú heag.)Levy, Hyman, agus Helen Spalding. Literature for an Age of Science. Methuen, 1952.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.