Penguin Books Ltd, Harmondsworth, Middlesex, England Penguin Books Pty Ltd, Ringwood, Victoria, Australia
First published in the U.S.A. by Doubleday 1962
Published in Great Britain by Dennis Dobson 1963
Published in Penguin Books 1964
Copyright © Isaac Asimov, 1962
Made and printed in Great Britain by Cox and Wyman Ltd, London, Fakenham, and Reading Set in Monotype Imprint
This book is sold subject to the condition that it shall not, by way of trade, be lent, re-sold, hired out, or otherwise disposed of without the publisher’s consent, in any form of binding or cover other than that in which it is published