First published in the magazine Playboy, July 1961 as "Machina Ex Deux".
| Date | Publication | Publisher | Type | Page | |
|---|---|---|---|---|---|
| 1962 |
|
Profiles of the Future | Gollancz | Nonfiction | 202 |
| 1963 |
|
Im höchsten Grade phantastisch | Econ | Nonfiction | 273 |
| 1964 | Im höchsten Grade phantastisch | Econ | Nonfiction | 273 | |
| February 1964 |
|
Profiles of the Future | Bantam Books | Nonfiction | 212 |
| February 1964 |
|
Profiles of the Future | Bantam Books | Nonfiction | 212 |
| January 1967 | Im höchsten Grade phantastisch | Econ | Nonfiction | 273 | |
| July 1969 |
|
Im höchsten Grade phantastisch | Fischer Bücherei | Nonfiction | 227 |
| 1973 |
|
Profiles of the Future | Pan Books | Nonfiction | 229 |
| March 1975 |
|
Looking Ahead | Harcourt Brace Jovanovich | Anthology | 373 |
| 1979 |
|
Profiles of the Future | Pan Books | Nonfiction | 229 |
| 1980 |
|
Profiles of the Future | Pan Books | Nonfiction | 229 |
| 1980 |
|
Profili budućnosti | Stvarnost Zagreb | Nonfiction | 227 |
| 1982 |
|
Profiles of the Future | Gollancz | Nonfiction | 229 |
| September 1983 |
|
Profiles of the Future | Pan Books | Nonfiction | 228 |
| 1984 | Profiles of the Future | Holt, Rinehart and Winston | Nonfiction | ||
| 1999 |
|
Greetings, Carbon-Based Bipeds!: A Vision of the 20th Century As It Happened | Voyager | Nonfiction | 217 |
| August 1999 |
|
Greetings, Carbon-Based Bipeds!: Collected Essays 1934-1998 | St. Martin's Press | Nonfiction | 217 |
| November 1999 |
|
Profiles of the Future: An Inquiry Into the Limits of the Possible | Gollancz | Nonfiction | 193 |
| December 2000 |
|
Profiles of the Future: An Inquiry Into the Limits of the Possible | Indigo | Nonfiction | 193 |
| December 2000 |
|
Profiles of the Future: An Inquiry Into the Limits of the Possible | Indigo | Nonfiction | 193 |