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Gilbert, D, (1969). The young child's awareness of affect. Chitd Development, 39, 619-636.
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http://www.jstor.org/stable/11274302
Savitsky, J. C. & Izard, C. E. (1970), Developmental changes in the use of emotion cues in a concept formation task. Developmental Psychology, 3, 350-357
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http://psycnet.apa.org/?&fa=main.doiLanding&doi=10.1037/h0030037