| Copyright Holder | Robert Silverberg |
| Publisher | Panther Science Fiction, Panther Books, Panther Books Ltd, Granada Publishing Limited |
| Format | Paperback |
| Language | English |
| Location | UK |
| Copyright | 1965 |
| This Edition Published | 1979 |
| Pages / Font | 144 pages |
| ISBN | 0 586 04562 7 |
| Price | 80p U.K |
| Price | 88p Rep Of Ireland |
| Price | $2.75 Canada |
| Price | $2.70 Australia |
| Price | $2.50 New Zealand |