3. Plomin, R.,& Daniels, D. (1986). Developmental behavioral genetics and shyness. In W. H. Jones, J. M. Cheek, & S. R. Briggs (Eds.), Shyness: Perspectives on research and treatment (pp. 63-80). New York: Plenum.

Heredity plays a larger role in shyness than in other personality traits. The purpose of this chapter is to review evidence concerning the etiology of
individual differences in shyness and to consider conceptual and clinical implications of findings that indicate genetic influence.