1970s List_of_dystopian_literature

^ clute, john (1993). levin, ira . in clute, john; nicholls, peter. encyclopedia of science fiction (2nd ed.). orbit, london. p. 715. isbn 1-85723-124-4. 
^ ursula le guin q&a | genre | guardian unlimited books . london: books.guardian.co.uk. february 9, 2004. retrieved may 29, 2010. 
^ cite error: named reference rch invoked never defined (see page).
^ cite error: named reference jcpn2 invoked never defined (see page).
^ survey of science fiction literature
^ downing, david c. (september 1, 1995). planets in peril: critical study of c.s. lewis s ransom trilogy. university of massachusetts press. p. 157. isbn 0-87023-997-x. 
^ walter, damien. darkness in literature: philip k dick s scanner darkly . guardian. retrieved august 4, 2013. 
^ kirkus reviews, october 1, 1979.