Gerald R. Patterson, Richard A. Littman, William Bricker, Assertive Behavior in Children: A Step toward a Theory of Aggression, Monographs of the Society for Research in Child Development, Vol. 32, No. 5, Assertive Behavior in Children: A Step toward a Theory of Aggression (1967), pp. iii-iv+1-43
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Patterson et al. (1967) studied this question.
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