De Onoverwinnelijke
| Book | Niezwyciężony (novel) |
| Format | Paperback |
| Language | Dutch |
| Copyright | 1964 |
| Original Title | Niezwyciężony |
| Original Language | Polish |
| Author | Stanisław Lem |
| Publisher | Uitgeverij Luitingh |
| Copyright Holder | Stanisław Lem |
| Cover/Jacket Design by | Henk de Boer |
| Translated by | Co de Groot |
| Format | Paperback |
| Language | Dutch |
| Location | Netherlands |
| Copyright | 1964 |
| Pages / Font | 187 pages |
| ISBN | 90 245 0296 9 |