Coplan, R. J.; Rose-Krasnor, L.; Weeks, M.; Kingsbury, A.; Kingsbury, M.; Bullock, A. (2012). «Alone is a crowd: Social motivations, social withdrawal, and socioemotional functioning in later childhood». Developmental Psychology49 (5): 861-875. PMID22686178. doi:10.1037/a0028861.
Chen, X.; Wang, L.; Cao, R. (2011). «Shyness-sensitivity and unsociability in rural Chinese children: Relations with social, school, and psychological adjustment». Child Development82 (5): 1531-1543. PMID21790539. doi:10.1111/j.1467-8624.2011.01616.x.
Coplan, R. J.; Rose-Krasnor, L.; Weeks, M.; Kingsbury, A.; Kingsbury, M.; Bullock, A. (2012). «Alone is a crowd: Social motivations, social withdrawal, and socioemotional functioning in later childhood». Developmental Psychology49 (5): 861-875. PMID22686178. doi:10.1037/a0028861.
Chen, X.; Wang, L.; Cao, R. (2011). «Shyness-sensitivity and unsociability in rural Chinese children: Relations with social, school, and psychological adjustment». Child Development82 (5): 1531-1543. PMID21790539. doi:10.1111/j.1467-8624.2011.01616.x.