By Colin Wilson
By Arthur C. Clarke
By Robert A. Heinlein
By Arthur C Clarke
By Robert Silverberg
By Alex Comfort
By ISAAC ASIMOV, etc.
By ISAAC ASIMOV
By Graham Masterton
By Manchip J White
By Stephen Baxter
By ISAAC ASIMOV, Robert Silverberg
By Frederik Pohl
By James White
By K. W. Jeter
By Brian Aldiss
By Greg Bear
By Douglas Adams