Buss، K. A.؛ Kiel، E. J. (2004). "Comparison of sadness, anger, and fear facial expressions when toddlers look at their mothers". Child Development. ج. 75 ع. 6: 1761–1773. DOI:10.1111/j.1467-8624.2004.00815.x. PMID:15566378.
Messinger، D (2002). "Positive and negative: Infant facial expressions and emotions". Current Directions in Psychological Science. ج. 11 ع. 1: 1–6. DOI:10.1111/1467-8721.00156. JSTOR:20182752.
Messinger، D (2002). "Positive and negative: Infant facial expressions and emotions". Current Directions in Psychological Science. ج. 11 ع. 1: 1–6. DOI:10.1111/1467-8721.00156. JSTOR:20182752.
nih.gov
pubmed.ncbi.nlm.nih.gov
Buss، K. A.؛ Kiel، E. J. (2004). "Comparison of sadness, anger, and fear facial expressions when toddlers look at their mothers". Child Development. ج. 75 ع. 6: 1761–1773. DOI:10.1111/j.1467-8624.2004.00815.x. PMID:15566378.