| Author | Isaac Asimov |
| Publisher | La Magrana* |
| Publisher Series | L'Esparver |
| Series | Autors Moderns |
| Translated by | Marta Bes Oliva |
| Series Designer | Pep Trujillo |
| Cover Art by | Antoni Garcés Clotet |
| Format | Paperback |
| Language | Catalan |
| Location | Barcelona, Spain |
| Copyright | 1988 |
| This Edition Published | 1988-04 |
| Pages / Font | 223 pages |
| ISBN 10 | 8474103657 |
| DL (Spanish) | B. 10.763-1988 |
| Series Number | 65 |
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