Referensi:
Hetherington, E. Mavis & Parke, Ross D. (2003). Child Psychology (Fifth Edition). New York, NY: McGraw-Hill.
Berk, Laura E. (2005). Infants, children, and adolescents. Fifth Edition. Boston, MA: Pearson Education, Inc.
Brooks, Jane B. (2011). The Process of Parenting. Eighth Edition. New York, NY: McGraw-Hill.
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