Why In Isaac Asimov's robot books what are the 3 laws?

I believe Asimov's three laws of robotics are: A robot shall not harm a human being, a robot may not cause harm to a human by not acting. A robot may not take an action which would result in the death or injury of a human. A robot may not all harm to come to a human in order to save it's own life.

It'sbeen years since I read any of Asimov's boooks but I think this is right!