Source : Robert Silverberg (2011). “Up the Line”, p.11, Hachette UK
Robert Silverberg
Clifford D. Simak
Writer
Frederik Pohl
Writer
Fritz Leiber
Film writer
Harlan Ellison
Writer
Isaac Asimov
Author
Poul Anderson
Author
Robert A. Heinlein
Science writer
Robert Sheckley
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Roger Zelazny
Writer