Gaya APA
Shaffer, D, R. (2001).
Developmental Psychology : Childhood & Adolescene (Sixth Edition).
Belmont CA:
Wadsworth Publishing Co.
Gaya MLA
Shaffer, David, R..
"Developmental Psychology : Childhood & Adolescene".
Sixth Edition
Belmont CA:
Wadsworth Publishing Co,
2001.
Text.