Referensi ;
Children's Therapy & Family Resource Centre. 2011. Toddler Developmental Milestones. http://www.kamloopschildrenstherapy.org/social-emotional-toddler-milestones ( Diakses 20 September 2021 )
Encyclopedia on Early Childhood Development. 2011. Emotions. https://www.child-encyclopedia.com/emotions ( Diakses 20 September 2021 )
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