Ditommaso, Lorenzo
Extrapolation 48(2): 267-291. Summer 2007.
Clarke, Arthur C.
Guardian (London) p. 2. December 29, 2000. (Cited from Lexis-Nexis, [4 pp.])
Poole, Robert
History and Technology 28(3): 255-280. 2010.
Williamson, Jack
in: Magill, Frank N., ed. Survey of Science Fiction Literature, Vol. 1. Englewood Cliffs, NJ: Salem Press, 1979. pp. 374-377.
Bailey, K. V.
Foundation No. 41:15-20. Winter 1987.
Candelaria, Matthew
Journal of American Culture 25(3/4): 427-432. September 2002.
Broderick, Damien
New York Review of Science Fiction 20(11): 1, 8-10. July 2008. (No. 239)
Disch, Thomas M.
in: Disch, Thomas M. On SF. Ann Arbor, MI: University of Michigan Press, 2005. p. 61-64.
Zivkovic, Zoran
Foundation No. 124: 85-91. 2016.
James, Edward F.
Foundation 41:42-51. Winter 1987.
Itzkoff, Dave
New York Times p. 5. March 23, 2008.
Bernstein, Jeremy
American Scholar 77(3): 154-157. Summer 2008.
Zebrowski, George
Free Inquiry 28(4): 29-31. June/July 2008.
Gillings, Walter H.
Algol 12(1):12-14. November 1974.
New York Review of Science Fiction No. 150: 1, 8-13. February 2001.
New York Review of Science Fiction No. 151: 10-17. March 2001.
Brull, Steven; Gross, Neil
Business Week p. 123-124. February 24, 1997.
Ariel 33(1): 37-62. January 2002.
Green, Joseph
Lan's Lantern No. 28:24-27. December 1988.
Clayton, Jay
American Literary History 25(2): 317-343. Summer 2013.
Simkins, Jennifer
Jefferson, NC: McFarland, 2016. 190 p.
Wolfe, G. K.
in: Magill, Frank N., ed. Survey of Science Fiction Literature, Vol. 4. Englewood Cliffs, NJ: Salem Press, 1979. pp. 1926-1929.
Slusser, George E.
San Bernardino, California: Borgo Press, 1978. 64 p.
in: Zivkovic, Zoran. First Contact and Time Travel: Selected Essays and Short Stories. New York: Springer, 2018. p. 3-36.
Laska, Alan D.
Lan's Lantern No. 28:21. December 1988.
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