A play, first produced in Prague on January 26, 1921. English language version opened in New York and London on October 9, 1922.
{{Tr|Paul Selver}}
| Date | Publication | Publisher | Type | Page | |
|---|---|---|---|---|---|
| 1954 |
|
The Treasury of Science Fiction Classics | Hanover House | Anthology | 304 |
| 1954 |
|
The Treasury of Science Fiction Classics | Hanover House / SFBC | Anthology | 304 |
| May 1954 |
|
Science-Fiction Thinking Machines: Robots, Androids, Computers | Vanguard Press | Anthology | 102 |
| 1963 |
|
Of Men and Machines | E. P. Dutton | Anthology | 3 |
| April 1983 |
|
The Arbor House Treasury of Science Fiction Masterpieces | Arbor House | Anthology | 96 |
| February 1984 |
|
The Arbor House Treasury of Science Fiction Masterpieces | Priam Books / Arbor House | Anthology | 96 |
| June 1984 |
|
Philosophy and Science Fiction | Prometheus Books | Anthology | 341 |