Placement
- contained in Futures Past: The Best Short Fiction of A. E. van Vogtcollection
- contained in Machines That Think: The Best Science Fiction Stories About Robots and Computersanthology
- contained in Science Fiction Special (15)omnibus
- contained in The Far-Out Worlds of A. E. van Vogtcollection
- contained in The Penguin Science Fiction Omnibusanthology
- contained in The Worlds of A. E. van Vogtcollection
- contained in We, Robotsanthology
- contained in Yet More Penguin Science Fictionanthology