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Coplan, R.J. & Bowker, J. (2014). A Handbook of Solitude: Psychological Perspectives on Social Isolation, Social Withdrawal, and Being Alone. New York: Wiley-Blackwell.
Killen, M. & Coplan, R.J. (2011). Social Development in Childhood and Adolescence: A Contemporary Reader. New York: Wiley-Blackwell.
Rubin, K.H. & Coplan, R.J. (2010). The Development of Shyness and Social Withdrawal. New York: Guilford.