Change this to Harvard style reference:
Sigelman, C. K., & Rider, E. A. (2012). Life-Span Human development. Belmont, USA: Wadsworth, Cengage
Learning.
Spelke, E. S., &
Sigelman, C. K., & Rider, E. A. (2012). Life-Span Human development. Belmont, USA: Wadsworth, Cengage
Learning.
Spelke, E. S., &