| Author | Isaac Asimov |
| Series | Robot |
| Publisher | HarperCollins Publishers |
| Imprint | Grafton |
| Cover Art by | Chris Foss |
| Format | Paperback |
| Language | English |
| Location | UK |
| Copyright | 1957 |
| First Printing in Country | 1956 |
| Pages / Font | 203 pages |
| ISBN | 0-586-01016-5 |
| Barcode | 9 780586 010167 |
| Barcode (EAN) | 00350 |
| Price | £3.50 |
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