| Copyright Holder | Robert A. Heinlein |
| Publisher Series | Panther Science Fiction |
| Imprint | Panther Books |
| Publisher | Granada Publishing Limited, Grafton |
| First Published by | Victor Gollancz Ltd |
| Printed by | Cox & Wyman Ltd |
| Format | Paperback |
| Language | English |
| Location | UK |
| This Edition Published | 1975 |
| Copyright | 1963 |
| Pages / Font | 112 pages |
| ISBN | 0 586 042040 |
Added by Supernaut1970