By Robert Silverberg
By Brian Aldiss
By Arthur C. Clarke
By Vladimir Volkoff, A. Sheridan
By T.Lobsang Rampa
By Jacqueline Wilson
By Terry pratchett
By Malcolm Saville
By R. M. Lockley
By Philip Cauthery, Martin Cole
By Adèle Geras, Peter Bailey
By Roger Kilroy
By Roma Thewes
By Moira Fowley-Doyle
By Patricia Finney
By J. Allen Hynek
By Bali Rai
By Kathleen Winsor
By Paul Stewart, Chris Riddell
By Carroll Fenton
By Jeanne DuPrau
By Barry Murray
By Catherine Johnson
By John Bellairs
By Philip Roth
By Jim Thompson