Gesloten Cirkel
| Format | Pocket book |
| Language | Dutch |
| Reissued | 1995-01-01 |
| Original Language | English |
| Author | Robert Goddard |
| Translated by | Bob Snoijink |
| Cover Art by | Mariska Cock |
| Format | Pocket book |
| Language | Dutch |
| Location | Sirene Pockets Bzztoh Den Haag Netherlands |
| Reissued | 1995-01-01 |
| Pages / Font | 397 pages |
| ISBN | 90 5831 039 6 NUGI 331 |
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