Russell, B. (1961). Has man a future? Penguin Books.
Chicago-Zitierstil (17. Ausg.)Russell, Bertrand. Has Man a Future? Harmondsworth: Penguin Books, 1961.
MLA-Zitierstil (8. Ausg.)Russell, Bertrand. Has Man a Future? Penguin Books, 1961.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.