Clareson, Thomas D.
Boston: G. K. Hall, 1983. 321 p.
Letson, Russell
in: Elkins, Charles L. and Greenberg, Martin H., eds. Robert Silverberg's Many Trapdoors: Critical Essays on His Science Fiction. Westport, CT: Greenwood, 1992. pp.15-38.
Tuck, D. H.
Magazine of Fantasy and Science Fiction 46(4):81-88. April 1974.
Silverberg, Robert
Locus 25(2): 6, 64-65. August 1990.
Locus 37(5): 6-7, 76-77. November 1996.
Elliot, J. M.
in: Elliot, Jeffrey, ed. Science Fiction Voices #2. San Bernardino, CA.: Borgo Press, 1979. pp. 51-62.
Future Life, No. 12, August 1970. and PSFQ 5:18-24. Spring 1981. Reprinted in: Elliot, Jeffrey, ed. Science Fiction Voices #2. San Bernardino, CA.: Borgo Press, 1979. pp. 51-62. and In: Silverberg, Robert. Living in the Future: Robert Silverberg on Science Fiction. Framingham MA: NESFA Press, 2023. p. 275-282.
Locus 52(3): 6-7, 64, 66-67. March 2004.
Magazine of Fantasy and Science Fiction 46(4):73-80. April 1974.
No authors listed.
Locus 18(2): 1, 48. February 1985.
Troen, Saul B.
Ph.D. Dissertation, New York University, 1995. 336pp. (DAI-A 56(5): 1762. November 1995.)
in: Silverberg, Robert. Reflections and Refractions: Thoughts on Science Fiction, Science, and Other Matters. Grass Valley, CA: Underwood Books, 1997. pp.413-415. (Reprinted from Heavy Metal, January 1981)
Malzberg, Barry N.
in: Malzberg, Barry N. Engines of the Night. Garden City, NY: Doubleday, 1982. pp. 77-84.
Speculation 15: 17-18. January 1967.
Kam, Rose S.
Extrapolation 17(1):18-28. December 1975.
Glyer, Mike
File 770 No. 153: 14-18. June 2008.
Locus 23(6):5. December 1989.
Science Fiction Times No. 452:1. March 1968.
Locus 17(12):5. December 1984.
Evans, Chris
Vector 81:11, 22-23. June 1977.
Science Fiction Chronicle 5(2):5. November 1983.
Science Fiction Chronicle 5(7):26,28. April 1984.
Algol 17(2):25-30. Spring 1980.
Starship 17(3):15-17. Summer 1980.
Starship 19(1):33-37. November 1982.
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