Coplan, R.J. (2025). The Joy of Solitude: How to Reconnect with Yourself in an Overconnected world. Simon & Schuster.

---

Coplan, R.J., Bowker, J.C., & Nelson, L.J. (2021). Handbook of Solitude: Psychological Perspectives on Social Isolation, Social Withdrawal, and Being Alone (2nd Edition). Wiley-Blackwell.

---

Coplan, R.J. & Rudasill, K. (2016). Quiet at School: An Educator’s Guide to Shy Children. Teachers College Press.

---

Coplan, R.J. & Bowker, J. (2014). A Handbook of Solitude: Psychological Perspectives on Social Isolation, Social Withdrawal, and Being Alone. Wiley-Blackwell.

---

Killen, M. & Coplan, R.J. (2011). Social Development in Childhood and Adolescence: A Contemporary Reader. Wiley-Blackwell.

---

Rubin, K.H. & Coplan, R.J. (2010). The Development of Shyness and Social Withdrawal. Guilford.