Shaffer, D. R. (2001). Developmental psychology: Childhood and adolescence (6th ed.). Wadsworth Thomson Learning.

Shaffer, David R. Developmental Psychology: Childhood and Adolescence. 6th ed. Australia ; Belmont, CA: Wadsworth Thomson Learning, 2001.

Shaffer, David R. Developmental Psychology: Childhood and Adolescence. 6th ed. Wadsworth Thomson Learning, 2001.