First published in the March 1942 issue of Astounding Science Fiction , "Runaround" is the second story in Asimov’s Robot series (following "Robbie"). However, it is the first story where Asimov explicitly laid out the Three Laws of Robotics in full text.
If you are looking for the text of the story or academic analysis, you can find them through these resources: isaac asimov runaround pdf