Placement
- contained in Isaac Asimov's Worlds of Science Fictionanthology
- contained in The Asimov Chronicles: Fifty Years of Isaac Asimovcollection
- contained in The Asimov Chronicles: Fifty Years of Isaac Asimov!: Volume Fivecollection
- contained in The Asimov Chronicles: Fifty Years of Isaac Asimov: Volume Twocollection
- contained in The Best Mysteries of Isaac Asimovcollection