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Baris 10:
* Russell and Fernandez-Dols, eds. (1997). ''The Psychology of Facial Expression''. Cambridge. {{ISBN|0-521-58796-4}}.
== Pranala luar ==
{{Commons category|Smiling}}
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* [http://news.bbc.co.uk/1/hi/health/3105580.stm BBC News: Scanner shows unborn babies smile]
{{psikologi-stub}}
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