Bandura conducted a classic study in the 1960's about the role of social learning in aggressive behaviours of children. It is also known as the "bobo doll experiment". Here's some handy resources:
- A four-minute video of Bandura discussing his research (Google Video). Clips from the Bobo doll study appear about 2 minutes and 40 seconds.
- Bobo doll experiment (Wikipedia)
- The full text of the seminal Bandura, Ross, and Ross article is available from “Classics in the History of Psychology”: Bandura, A., Ross, D., & Ross, S. A. (1961). Imitation of film-mediated aggressive models. Journal of Abnormal and Social Psychology, 66, 3-11.