Kip Thorne,

Black Holes and Time Warps , Norton, New York, 1994

H.G. Wells,

The Time Machine , Penguin Classics, London, 2005 (first published 1895)

Clifford Will,

Was Einstein Right? , Basic Books, New York, 1986

Jack Williamson,

The Legion of Time , Sphere, London, 1977

John Wyndham (Lucas Parkes),

The Outward Urge ,

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