Tik-Tok and The Three Laws of Robotics

'''Abrahm, Paul M. and Stuart Kenter. "Tik-Tok and The Three Laws of Robotics."' SFS'' #14, 5.1 (March 1978): 67-80.

L. Frank Baum's Oz series (1900-1921) anticipates Asimov's Three Laws of Robotics in its presentation of the Tik-Tok Machine Man (a kind of early robot).