A comprehensive article on the kind of interaction that promotes healthy socialization in children, from Child Education.
This website provides the history of socialization in the human race.
"The information and links on this page have been chosen to give parents some insight into the dynamics of peer relationships. Explore the provided links to examine your child's social skills and behaviors. Understanding your child's strengths and weaknesses in social interaction and behavior may be the key to building healthy and enjoyable relationships with their peers."
This article discusses when and how toddler socialization develops, what comes next, and when to be concerned.