Kilder
Lehmann-Haupt, Christopher:
Slaughterhouse Five, Or the Children’s Crusade. New York Times, 1969-03-31.
Shircore, Ian:
Douglas Adams: The First and Last Tapes. Darker Matter – Online Science Fiction Magazine, 1979. (Konstateret utilgængelig 2020-06-08)
Spaceling:
Philip K. Dick on Kurt Vonnegut. Mog, 2007.