Helfers, John
in: Carl, Lillian S. and Helfers, John, eds. The Vorkosigan Companion. New York: Baen, 2008. p. 77-84.
Greenberg, Martin H.; Helfers, John
Eugenia: The Battered Silicon Dispatch Box, 2012. 596 p.
Carl, Lillian S.; Helfers, John
New York: Baen Books, 2008. 678 p.
Burkhead, Ed; Helfers, John; Hughes, Kerrie
in: Carl, Lillian S. and Helfers, John, eds. The Vorkosigan Companion. New York: Baen, 2008. p. 245-451.
in: Carl, Lillian S. and Helfers, John, eds. The Vorkosigan Companion. New York: Baen, 2008. p. 213-244.
SFWA Bulletin 42(2): 22-24. October/November 2008. (No. 179)
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