Jameson, Fredric. "The Unknowability Thesis." In Archaeologies of the Future: This Desire Called Utopia and Other Science Fictions. London and New York: Verso, 2005. Suvin, Darko. "Three World Paradigms for SF: Asimov, Yefremov, Lem." Pacific Quarterly (Moana): An International Review of Arts and Ideas'' 4.(1979): 271–283.
Jameson Fredric "The Unknowability Thesis" In Archaeologies of the Future This Desire Called Utopia and Other Science Fictions London and New York Verso 2005 Suvin Darko "Three World Paradigms for SF Asimov Yefremov Lem" Pacific Quarterly (Moana) An International Review of Arts and Ideas'' 4(1979) 271–283