| Author | Isaac Asimov |
| Copyright Holder | Isaac Asimov |
| Publisher Series | Panther Science Fiction |
| Publisher | Panther Books, Granada Publishing Limited |
| First Published by | Doubleday & Company, Inc. |
| Printed by | Hunt Barnard & Co Ltd* |
| Series | Multivac, Robot |
| Format | Paperback |
| Language | English |
| Location | UK |
| Copyright | 1957 |
| This Edition Published | 1960 |
| Reprinted | 1962 |
| Reprinted | 1967 |
| Reprinted | 1967 |
| Pages / Font | 176 pages |
| Other | 1042 |
| Price | 3/6 United Kingdom |
| Price | 60c Australia |
| Price | (4/6) 45c New Zealand |
| Price | 45c South Africa |