Feshbach, N. (1969) `Sex Differences in Children's Modes of Aggressive Responses Toward Outsiders', Merrill Palmer Quarterly15: 249-58.
2.
Lagerspetz, K.M., Bjorkqvist, K. and Peltonen, T. (1988) `Is Indirect Aggression Typical of Females? Gender Differences in Aggressiveness in 11- to 12-year-old Children', Aggressive Behavior14: 403-14.