By Schellenberg E.G.   Trehub S.E.   in Journal of Experimental Child Psychology

ISSN:0022-0965|74|2|107-127

Academic Press‎(1999)‎

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By Milligan K.   Atkinson L.   Trehub S.E.   Benoit D.   Poulton L.   in Infant Behavior and Development

ISSN:0163-6383|26|1|1-13

Elsevier‎(2003)‎

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