Asimov, Isaac (1950). „Runaround”. I, Robot(hardcover) (на језику: енглески) (The Isaac Asimov Collection изд.). New York City: Doubleday. стр. 40. ISBN978-0-385-42304-5. „This is an exact transcription of the laws. They also appear in the front of the book, and in both places there is no "to" in the 2nd law.”