Summerlin, Herb
Lan's Lantern 11:25-26. July 1981.
DeMarr, Mary J.
MidAmerica 22:108-121. 1995.
Jazbec, Milan
European perspectives Loka pri Mengšu: Center for European perspective 13(1[23]): 131-160. April 2022.
Foote, Bud
in: Slusser, George, Westfahl, Gary, and Rabkin, Eric S., eds. Immortal Engines: Life Extension and Immortality in Science Fiction and Fantasy. Athens: University of Georgia Press, 1996. pp.193-200.
Pohl, Frederik
in: Pohl, Frederik, ed. The SFWA Grand Masters. Vol. 1. New York: Tor, 1999. p. 217-218.
Ioakimidis, Demetre
Fiction No. 125: 129-137. avril 1964.
Manlove, Colin N.
in: Manlove, C. N. Science Fiction: Ten Explorations. Kent, OH: Kent State University Press, 1986. pp.161-180.
In: Manlove, Colin N. Science Fiction: Ten Explorations. Kent, OH: Kent State University Press, 1986. p. 161-180.
Becker, M. R.
Boston: G. K. Hall, 1980. 149 p.
Thiel, John
Lan's Lantern 11:63-65. July 1981.
Barrett, Mike
New York Review of Science Fiction 21(11): 19-21. July 2009. (No. 251)
Miller, Faren
Locus 21(7):45. July 1988.
Williamson, Jack
Del Rey, Lester
Stephensen-Payne, Phil
Albuquerque, NM: Galactic Central, 1991. 64pp.
Clareson, Thomas D.
in: Clareson, Thomas D., ed. Voices for the Future: Essays on Major Science Fiction Writers, Vol. 1. Bowling Green, Ohio: Bowling Green Univ. Popular Press, 1976. pp. 64-88.
Lyall, Francis
Bath, UK: Paragon Publishing, 2020. 200 p.
Anderson, Poul
Locus 21(6):77. June 1988.
Asimov, Isaac
Locus 21(6):76-77. June 1988.
Dickson, Gordon R.
Locus 21(6):76. June 1988.
Gunn, James E.
Heinlein, Robert A.
Locus 21(6):75-76. June 1988.
No authors listed.
Locus 21(6):1, 75-77. June 1988.
Brohaugh, Bill
Janus 2(2): 19-22. June 1976. (No. 4)
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