1. Ekman, P., Liebert, R.M., Friesen, W.V., Harrison, R., Zlatchin, C., Malmstrom, E.J. & Baron, R.A. (1972). Facial expressions of emotion while watching televised violence as predictors of subsequent aggression In G. A. Comstock, E. A. Rubinstein, & J. P. Murray (Eds.), Television and social behaviour: Vol. 5. Television's effects: Further explanations (pp. 22-58). Washington, DC: U.S. Government Printing Office.
2. National television violence study: Vol. 2. Executive summary.,1997