Russell, B. (1961). Has man a future? Penguin Books.
Lua i Stíl Chicago (17ú heag.)Russell, Bertrand. Has Man a Future? Harmondsworth: Penguin Books, 1961.
Lua MLA (8ú heag.)Russell, Bertrand. Has Man a Future? Penguin Books, 1961.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.