Campbell, John W., Jr.; Geffe, P. R.; McConnell, J. V.; Rothman, M. A.
in: Knight, Damon, ed. Turning Points: Essays in the Art of Science Fiction. New York: Harper, 1977. pp. 175-196.
Rothman, M. A.
OnComputing 2(3): 60-62. Winter 1980.
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