| Publisher | The Science Fiction Book Club |
| Copyright Holder | Bantam Books, Inc., William Tenn |
| First Published by | Victor Gollancz |
| Printed by | Lowe & Brydone Printers Limited |
| Author | William Tenn |
| Format | Hardback |
| Language | English |
| Location | UK |
| Copyright | 1958 |
| Copyright | 1963 |
| This Edition Published | 1964 |
| Pages / Font | 153 pages |
| Catalog Number | 84 |