Fairchild, L., & Erwin, W. M. (1977). Physical punishment by parent figures as a model of aggressive behavior in children. Journal of Genetic Psychology, 130 (2), 279-284.

Abstract:  Investigated the effect of a filmed, physically punitive parent model on the behavior of 60 1st grade boys. It was hypothesized that a filmed sequence of a parent physically punishing a child would stimulate significantly more aggressive behavior in a group of observing boys than would be stimulated in a group who viewed a nonpunitive film. Results show that the total percentage of aggressive responses emitted in doll play was significantly higher for the punitive than for the nonpunitive group. (PsycINFO Database Record (c) 2004 APA, all rights reserved)