@nqyringmind,
Glad to see another Knight fan on this forum. Serling was sometimes less than open about the sources for his
Twilight Zone episodes. I seem to recall that Bradbury got pissed at him once for not crediting a story that he (Serling) tried to pass off as original when, in fact, it was an adaptation. Serling, it was said, didn't want to pay the royalties.